Effect of [GA.sub.3], KN[O.sub.3], and removing of basal point of seeds on germination of sweet granadilla (Passiflora ligularis Juss) and yellow passion fruit (Passflora edulis F. flavicarpa)/Efeito do [GA.sub.3], KN[O.sub.3] e o desponte basal nas sementes em germinacao de granadilla (Passiflora ligularis Juss) e o maracuja comum (Passiflora edulis F. flavicarpa).
The cultivation of sweet granadilla (P. ligularis) represents an important item in Colombian export market. Within the market for exotic fruits in 2008 this fruit ranked the second one ($ 2,500,000) (PROEXPORT, 2009). This culture despite being relatively new, has undergone rapid expansion due to favorable soil and climatic conditions for cultivation in the country and its high market demand. In case of yellow passion fruit, Colombia stands out as the third largest producer of this fruit, with 91,870 t produced in 2009 and an average annual rate of 5.6% of production.
The germination of seeds of Passiflora is slow possibly due to the exogenous dormancy, which could be a combination of mechanical and chemical dormancy, the last one due to the presence of inhibitors in seeds (DELANOY et al., 2006). In this regard, studies on germination of P. ligularis are scarce. Germination in seeds of yellow passion fruit has already been addressed in a number of studies; however, for the environmental conditions of the Colombian fruit producing regions, no studies have been conducted.
Soaking seeds of P. edulis Sims (DELANOY et al., 2006) and P. alata (ROSSETTO et al., 2000) in solutions of giberrelic acid ([GA.sub.3]) after performing mechanical scarification favored germination percentage (PG). In seeds of P. nitida, soaking in [GA.sub.3] increased PG and changed the germination response to light conditions (PASSOS et al., 2004). In P. giberti [GA.sub.3] application did not overcome the seed dormancy (FERREIRA et al., 2002).Previous experiments in our lab have shown that the response in germination of seeds of P. ligularis to the application of [GA.sub.3] depends on the temperature and, especially, light conditions, achieving better responses with high concentrations of GA in light and low concentrations in darkness.
The functions specific to gibberellin induction of seed germination include promotion of elongation of hypocotyl and stem (RICHARDS et al., 2001). [GA.sub.3]-deficient tomato mutants could not initiate the process of seed germination (LIU et al., 1994).
Several nitrogen compounds promote the breaking of seed dormancy and stimulate seed germination, among these KN[O.sub.3] is recommended for testing the germination of many species (BRAZIL, 2009) and is mainly related to seed germination of photoblastic seeds, such as of Passiflora (BALAGUERA et al., 2010).
The goal of this research was to study the effect of exogenous application of [GA.sub.3], mechanical scarification and KN[O.sub.3] on the germination of seeds of yellow passion fruit and sweet granadilla under controlled conditions of light and temperature.
MATERIALS AND METHODS
The fruits of two accessions of sweet granadilla named PrJ1 and PrJ2 were collected in the municipality of Palestina, Huila province (Colombia) in a farm located at 1,807 m.a.s.l. with coordinates 01 [degrees] 41.630 'N and 076[degrees] 07.387' W. Yellow passion fruit seeds were extracted from fruits obtained from the municipality La Plata, Huila province (Colombia), located in a commercial crop culture at 1,112 m.a.s.l. with coordinates 2[degrees] 21.830 'N and 075[degrees] 54.908' W. In all cases, the aryl was removed from seeds by letting the seeds fermenting with the aryl for three days and removing it with a strainer. Seeds without aryl were allowed drying up for three days at room temperature (20[degrees]C) in the darkness. Dried seeds reached humidity contents between 10 and 12%.
In Crop Physiology Laboratory of the Faculty of Agronomy, National University of Colombia, Bogota campus, the best concentration of KN[O.sub.3] was determined for treating the seeds of sweet granadilla, than these were placed to germinate in Petri dishes on filter paper in germination chambers Sanyo LMR-351 (Japan), at 30/20[degrees]C (12 h/12 h), 85% RH in complete darkness. The treatments consisted of applying solutions of 0 (distilled water), 0.1, 0.2, or 0.5% (w / v) KN[O.sub.3] throughout the germination test which lasted 32 days.
In a preliminary experiment (data not shown) with sweet granadilla seeds germinated on filter paper, the treatments with best results in the germination of this species were: [GA.sub.3] (50, 100, 200 and 400 mg [L.sup.-1]) and removing of basal point of seeds (RB). These treatments, along with the optimal concentration of KN[O.sub.3], selected from the preliminary experiment, were tested in greenhouse conditions on two accessions of sweet granadilla and one accession of yellow passion fruit.
In the greenhouse facilities of Corporation CEPASS-Huila located in the municipality of La Plata, the seeds of sweet granadilla and yellow passion fruit were imbibed for 48 hours in solutions of [GA.sub.3] (50, 100, 200 and 400 mg [L.sup.-1]), or KN[O.sub.3] (0.1% w / v) and distilled water using seeds with removing of basal point and uncutted seeds as controls. The germinated seeds were placed in trays of 50 alveoli filled with Base Substrate Klasmann[R] (Klasmann-Deilmann, Geeste, Germany) without nutrients added. The trays were watered to field capacity and placed in the dark room (temperature between 18 and 34[degrees]C, relative humidity between 61 and 99%) of the greenhouse for 10 days. Then the trays were moved to the greenhouse plastic cover (temperature between 20 and 33[degrees]C), where they remained for 22 days. The trial lasted a total of 32 days, where seedling emergence was recorded every 2 days.
At the end of both tests, the laboratory and the greenhouse, the percentage of final germination (PG), the average time of germination (ATG) and the mean germination rate (MGR) were calculated
TMG = [[summation].sup.k.sub.i=1][n.sub.i][t.sub.i]/[[summation].sup.k.sub.i=1] [n.sub.i] (1)
VMG = [[summation].sup.k.sub.i=1] [n.sub.i]/[t.sub.i] (2)
where: [n.sub.i] = number of germinated seeds in the ith data collection, [t.sub.i] = time (in days) of the ith data collection and K = time (in days) of the duration of germination test (RANAL and SANTANA, 2006, RASHID et al., 2010).
In the greenhouse, in seedlings of sweet granadilla of both accessions were measured leaf area, total dry weight, dry weight of the stem, leaves and roots of each seedling at 15 days after initiating the emergency, from KN[O.sub.3] treatments and controls, taking five replicates per treatment. With these data, the specific leaf area (leaf area / leaf weight) and the ratio root / shoot were calculated.
An analysis of variance (ANOVA) and Tukey's test (P <0.05) were done to determine differences among the treatments using the SAS software V. 9.2.
RESULTS AND DISCUSSION
For the treatment with KN[O.sub.3], the highly significant differences among PG were recorded for seed PrJ1 accession; the highest PG, 96.33% was achieved with 0.1% KN[O.sub.3]. For PrJ2, PG reached 0.1% KN[O.sub.3] (88.33%) and did not present statistical differences with the highest PG (92.67%) recorded for that accession. Thus, 0.1% KN[O.sub.3] was the concentration that was further selected for testing germination of sweet granadilla seeds (Table 1). This indicates the need to use this salt in germination tests, as well as substrates enriched with potassium nitrate in the commercial propagation of sweet granadilla.
The MGT for both accessions was lower in treatment with KN[O.sub.3] (16.09 d to PrJ1 and 19.6 d to PrJ2) (Table 2), this treatment also reached the highest MGR (3.3 [d.sup.-1] seeds PrJ1 and 2.2 [d.sup.-1] for seeds PrJ2), while the lowest values of this index were recorded in the RB treatment (Table 2).
There was higher variability among the treatments in MGT than MGR values (Table 1), indicating that differences in PG were due more to differences in the number of days it takes for seeds to germinate than in the number of seeds germinated per day. This could be related to a more rapid activation of metabolic processes.
Under greenhouse conditions, RB treatment had the highest decrease of PG compared to other treatments (Table 2), and this occurred in seeds of two accessions of sweet granadilla and seeds of yellow passion fruit. In this respect, there was a high presence of fungi near the basal region at the end of the test, suggesting higher sensitivity of this treatment to environmental conditions without full management of external biological agents.
In seeds of sweet granadilla, the response of PG varied among accessions, although both the ANOVA indicated a significant effect (P <0.01) treatments, the only response PrJ1 different from control was in the treatment of removing of basal point of seeds. The other treatments showed increases KN[O.sub.3] (92%) compared to the control (82%), but these were not significant (P> 0.05). In the seeds of both accessions, there was a tendency to decrease PG with increasing concentration of [GA.sub.3] (Table 2), more marked in PrJ2 which recorded a significant decrease in PG in solution of 400 mg [L.sup.-1] [GA.sub.3] compared with other [GA.sub.3] treatments, with the control (77.3%) and the treatment of KN[O.sub.3] (86.6%).
The content of endogenous nitrate in each seed is dependent on various aspects of genetics and nutrition of the mother plant during the seed formation. It is demonstrated that increasing the amount of nitrate supply to the mother plant during seed maturation lead to less number of dormant seeds (MATAKADIS et al., 2009). In this context, it is likely that there were differences in the nitrate content of seeds among the accessions of sweet granadilla, a factor that could affect the responses to the application of KN[O.sub.3], [GA.sub.3], and scarification.
Nitrogen compounds affect germination through the detection of nitrogen in the soil. These could stimulate the pentose phosphate pathway in seeds and, thus, seed germination by increasing the oxidation of NADPH to NADH. Nitrate can alter hormone levels by inducing the expression of enzymes that catalyze the inactivation of abscisic acid ABA (CYP707A2) and the biosynthesis of gibberellins (GAox1) (FINCH et al., 2007). In seeds of yellow passion fruit, as well as in seeds of PrJ1, only the RB treatment showed a significant change of the PG compared with the control (88.66%), with a drastic reduction of this value (28%) and reduction in MGR (1.19 germinated seeds per day) (Table 2).
Importantly, the values of germination in controls and those of MGR and MGT in all treatments were better and more homogeneous in seeds of yellow passion fruit than in two accessions of sweet granadilla (Table 2). This may indicate, first, the possibility that the conditions under which the experiment was developed would have been better for the germination of seeds of yellow passion fruit than for the seeds of sweet granadilla. On the other hand, it is likely that the seeds of yellow passion fruit did not exhibit dormancy, it was a weaker dormancy or related with other factors than in seeds of sweet granadilla, which could be related to a longer time of domestication that had the culture of yellow passion fruit with respect to sweet granadilla.
In seedlings of PrJ1, pre-imbibition of seeds in KN[O.sub.3] had a significant effect on leaf area, dry weight of leaves, specific leaf area and total plant weight, but its effect was not significant on dry mass of stem and root, or the root / shoot ratio. In case of seedlings PrJ2, no variable showed significant response to seed treatment with KN[O.sub.3]. Despite this, shoots and roots of PrJ2 showed the tendency to gain more dry weight with seeds soaked in KN[O.sub.3] compared to unsoaked seeds (Table 3).
The total mass of the seedling and leaves and leaf area were significantly higher in seedlings coming from seeds PrJ1 treated with KN[O.sub.3], keeping the same trend in the case of PrJ2 (Table 3). The opposite occurred with specific leaf area (Table 3), indicating that KN[O.sub.3] may contribute more to the expansion of leaves than to the mass gain by leaves.
The observed effect of potassium nitrate is well known in other species and could be explained because it supplies the system requirements of phytochrome in photoblastic seeds (MATAKIADIS et al., 2009), suggesting physiological dormancy mechanisms in seeds of sweet granadilla. In yellow passion fruit the results do not show differences between treatments (data not shown) which could suggest its seeds are less sensible to light stimuli than granadilla seeds.
Due to the environmental dependence of phytochrome functioning, it is likely that the response of germination has been strongly influenced by environmental conditions prevailing in the greenhouse. Additionally, it is important to note that the response of seeds to [GA.sub.3] and KN[O.sub.3] treatments is strongly influenced by the time of seed storage (PADUA et al., 2011). In the present experiment, seeds were not stored, so this results could change in stored seeds due the natural process of ageing.
The application of KN[O.sub.3] to seeds increased and significantly accelerated the germination of fresh seeds of sweet granadilla in laboratory conditions (filter paper) and greenhouse (peat substrate), however, its effect depended on the accession of the seeds. The application of KN[O.sub.3] (0.1%) had no significant effect on the germination of yellow passion fruit in greenhouse conditions in the municipality of La Plata. The application of [GA.sub.3] (50, 100, 200, or 400 mg L-1) did not significantly increase germination of sweet granadilla seeds or yellow passion fruit seeds in greenhouse conditions in the municipality La Plata. Soaking the seeds in a solution of KN[O.sub.3] (0.1%) significantly affected the growth of seedlings in one of the two accessions of sweet granadilla.
Acknowledges are extended to Corporation CEPASS-Huila and the Faculty of Agronomy of the National University of Colombia for the technical and logistical support in the development of this research.
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JULIAN CARDENAS (2), CARLOS CARRANZA (2), DIEGO MIRANDA (3), STANISLAV MAGNITSKIY (3)
(1) (Trabalho 113-12). Recebido em: 19-03-2012. Aceito para publicacao em : 05-07-2013.
(2) Ingeniero Agronomo, M.Sc. Fisiologia de Cultivos, Universidad Nacional de Cultivos, Sede Bogota. E-mail: firstname.lastname@example.org; email@example.com.
(3) Profesor Asociado, Facultad de Agronomia, Universidad Nacional de Colombia, Sede Bogota. E-mail: firstname.lastname@example.org; email@example.com.
TABLE 1--Effect of four concentrations of potassium nitrate on the germination of two accessions of sweet granadilla. Concentration MGR of KN[O.sub.3] (germinated Accession (%) PG (%) MGT(d) seeds/d) PrJ1 0 62.7 c 11.62 b 6.45 bc 0.1 96.33 a 11.20 b 10.56 a 0.2 80.33 b 12.98 ab 8.53 ab 0.5 81.67 ab 14.35 a 6.11 c PrJ2 0 68.00 b 11.9 b 6.80 a 0.1 88.33 a 12.51 b 8.53 a 0.2 86.33 a 15.41 a 6.88 a 0.5 92.67 a 12.36 b 8.83 a CV (%) 10.38 6.03 8.26 TABLE 2--Percentage of germination (PG), mean gemination time (MGT) and mean germination rate (MGR) of seeds of sweet granadilla for accessions PrJ2, PrJ 1 and yellow passion fruit, grown in peat substrate in greenhouse conditions in La Plata (Colombia) PG (%) PrJl PrJ2 Yellow passion fruit [50GA.sub.3] 82.67 a 82.00 ab 88.66 a [100ga.sub.3] 86.00 a 82.67 ab 84 a [200GA.sub.3] 83.33 a 70.67 ab 78.66 a [400GA.sub.3] 76.67 a 65.33 b 82 a [KNO.sub.3] 92.00 a 86.67 a 88.66 a RB 12.00 b 33.33 c 28 b Control 82.00 a 77.33 ab 88.66 a CV(%) 8.54 10.62 6,61 MGR(germinated seeds/day) PrJl PrJ2 Yellow passion fruit [50GA.sub.3] 2.17 b 2.01 a 3.4 ab [100ga.sub.3] 2.15 b 1.93 a 2.7 c [200GA.sub.3] 2.15 b 1.75 a 3.27 be [400GA.sub.3] 1.97 b 1.78 a 3.46 ab [KNO.sub.3] 3.30 a 2.29 a 3.6 ab RB 0.36 c 0.87 b 1.19 d Control 2.49 b 1.96 a 3.94 a CV(%) 10.96 12.31 6,62 MGT (day) PrJl PrJ2 Yellow passion fruit [50GA.sub.3] 20.81 ab 20.45 ab 13.64 ab [100ga.sub.3] 21.83 ab 20.83 a 15.82 a [200GA.sub.3] 21.37 ab 20.65 ab 13.16 ab [400GA.sub.3] 19.66 a 21.16 b 13.06 b [KNO.sub.3] 19.68 c 16.10 b 13.21 ab RB 19.94 be 18.50 ab 13.8 ab Control 20.23 ab 19.34 ab 12.19 b CV(%) 4.73 3.33 7,21 Treatment means in the same column followed by the same letter are not significantly different at 1% level of Tukey Test TABLE 3--Total dry mass, dry mass of leaves, leaf area and specific leaf area of seedlings of the accessions and PrJ1 and PrJ2, from seeds soaked in KN[O.sub.3] solution or water. Accession Treatment Leaf area Dry mass of ([cm.sup.2]) leaves (mg) PrJl Control 13.42 b 35.66 b KN[O.sub.3]] 24.07 a 83 a PrJ2 Control 14.32 b 44.66 b KN[O.sub.3]] 16.27 ab 50.66 b CV(%) 20.15 14.92 Accession Treatment Total dry Specific leaf mass (mg) area ([cm.sup.2] [mg.sup.-1]) PrJl Control 68.67 b 0.37 a KN[O.sub.3]] 135 a 0.28 b PrJ2 Control 79.67 b 0.31 ab KN[O.sub.3]] 90.67 ab 0.32 ab CV(%) 23.55 8.63 Treatment means in the same column followed by the same letter are not significantly different at 1% level of Tukey Test
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|Title Annotation:||texto en ingles|
|Author:||Cardenas, Julian; Carranza, Carlos; Miranda, Diego; Magnitskiy, Stanislav|
|Publication:||Revista Brasileira de Fruticultura|
|Date:||Sep 1, 2013|
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