Arabidopsis defense mutant ndr1-1 displays accelerated development and early flowering mediated by the hormone gibberellic acid

Gibberellic acid (GA) is an important phyto-hormone mediating plant growth. In present study, we evaluated the impact of GA treatment on morphological, phenological and molecular aspects of five mungbean genotypes. GA treatment caused a significant increase in plant height and branch angle in most of the genotypes. However, there was no impact of GA treatment on days to first anthesis, days to 50% flowering and pod length. Genotypes SML-859 and EC-48 revealed no change in their plant height and branch angle respectively upon GA treatment, suggestive of their probable GA insensitivity. Expression of flowering associated gene- VrSOC1 remained unaffected by GA treatment, validating thereby that exogenously supplied GA does not induce early flowering in mungbeans.

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Effects of Seasonal Variation and Gibberellic Acid Treatment on the Growth and Development of Gypsophila paniculata

HortScience ◽

10.21273/hortsci14156-19 ◽

2019 ◽

Vol 54 (8) ◽

pp. 1370-1374

Author(s):

Fan Li ◽

Guoxian Wang ◽

Rongpei Yu ◽

Min Wu ◽

Qinli Shan ◽

...

Keyword(s):

Gibberellic Acid ◽

Vegetative Growth ◽

Growth And Development ◽

Acid Treatment ◽

Early Flowering ◽

Low Latitude ◽

Planting Time ◽

Gypsophila Paniculata ◽

Autumn And Winter ◽

Gibberellic Acid Treatment

We investigated the effects of different planting seasons and gibberellic acid treatments on the growth and development of Gypsophila paniculata to explore new approaches to controlling the flowering period. Four different cultivars were selected and continually planted in July, September, and November in the low-latitude and high-altitude region of Kunming, China (25° N, 102° E). Results showed that the vegetative growth and flowering time of Gypsophila paniculata were prolonged and postponed when the planting time was delayed. Specifically, ‘My Pink’ showed 20% and 80% rosette rates when grown in autumn and winter, respectively, thus indicating that Gypsophila paniculata is sensitive to planting time. Moreover, GA3 treatment not only can significantly promote vegetative growth but also can stimulate early flowering and suppress the occurrence of rosettes during winter. This is more specific to ‘My Pink’, which showed 40% and 80% reductions in rosette rates with four and eight GA3 treatment applications, respectively. Our study showed that seasonal variations in the growth and development of Gypsophila paniculata and GA3 treatment can effectively stimulate early flowering and suppress rosettes during winter.

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Effect of giberellic acid (GA4/7) and girdling on induction of reproductive structures in Pinus patula

Forest Systems ◽

10.5424/fs/2016252-09254 ◽

2016 ◽

Vol 25 (2) ◽

pp. e063 ◽

Cited By ~ 1

Author(s):

J-Jesus Vargas-Hernandez ◽

Jeniffer-Ivette Vargas-Abonce

Keyword(s):

Gibberellic Acid ◽

Seed Production ◽

Seed Orchard ◽

Juvenile Stage ◽

Early Flowering ◽

Pinus Patula ◽

Induction Treatment ◽

Male And Female ◽

Stem Girdling ◽

Male Strobili

Aim of study: Seed production in forest tree species commonly takes a long time due to the length of the juvenile stage. Even though several treatments have been used to induce early flowering in conifer species, experience on their use in subtropical Pinus species is limited. This study aimed to evaluate the effect of GA4/7 dose (0, 1.27 and 2.54 mg cm-2) and application time (July-October), alone or in combination with partial stem girdling, on male and female strobili production in young Pinus patula Schiede ex Schltdl. et Cham. clones. Area of study: Nine clones with different flowering background of high-elevation Pinus patula growing in a six-year old seed orchard established in Central México (Aquixtla, Puebla) at 2,800 m elevation.Material and methods: Two independent flowering trials (FT1 and FT2) were carried out in the seed orchard during the 2009 and 2010 flowering cycles; similar factors were evaluated at both trials but time of application, clones tested, and experimental design used varied for each of them. Partial stem girdling was done at the base of the trunk and the GA4/7 solution was injected into the xylem above the point of girdling. The following spring, the percentage of trees with strobili and the number of strobili per tree were determined for both male and female structures.Main results: Significant differences (p ≤ 0.05) among clones in flowering capacity were found at both trials. None of the treatments applied in FT1 resulted in an increase of strobili formation, most probably because they were applied too late in the growing season. In FT2, however, application of GA4/7 combined with partial stem girdling increased the percentage of trees with strobili and the number of strobili of both sexes, particularly when applied in early July. Partial stem girdling was more effective on promoting male strobili than female ones in gibberellin-treated grafts.Research highlights: Timing of GA4/7 application and stem girdling was important, with a significant interaction with clones tested in FT2 on production of male strobili but not on female strobili. Application of 1.27 mg cm-2 GA4/7 and stem girdling in July promoted the highest percentage of trees with strobili, and increased 25-fold the number of female strobili and 5-fold the number of male strobili per tree as compared to the control treatment. Thus, operational use of this induction treatment would be valuable to increase and accelerate seed production in Pinus patula seed orchards in the region.Keywords: early flowering; gibberellins; juvenile stage; seed orchard; seed production.Abbreviations: GA: Gibberellic acid; GA4: Gibberellic acid 4; GA7: Gibberellic acid 7; GA4/7: Mix of gibberellic acids 4 and 7; FT1: Flowering trial carried out in the 2009 season; FT2: Flowering trial carried out in the 2010 season.

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Cluster-Zone Leaf Removal and GA3 Application at Early Flowering Reduce Bunch Compactness and Yield per Vine in Vitis vinifera cv. Pinot Gris

Horticulturae ◽

10.3390/horticulturae8010081 ◽

2022 ◽

Vol 8 (1) ◽

pp. 81

Author(s):

Mario Wegher ◽

Michele Faralli ◽

Massimo Bertamini

Keyword(s):

Gibberellic Acid ◽

Vitis Vinifera ◽

Yield Components ◽

Fruit Set ◽

Early Flowering ◽

Soluble Solids ◽

Leaf Removal ◽

Total Soluble Solids ◽

Training Systems ◽

Berry Quality

Compact bunches have been often associated with higher susceptibility to Botrytis cinerea and therefore reduction in berry quality in grapevine. The objective of this study was to evaluate three management methods (early leaf removal, gibberellic acid, and their combination) for reducing bunch compactness in Vitis vinifera cv. Pinot gris trained in two different training systems with contrasting vigor (Guyot and pergola). Treatments were applied at BBCH 62 or BBCH 65 and yield components, total soluble solids, fruit set, and bunch compactness parameters were evaluated. Both treatments individually reduced berry number, mean bunches weight and bunches compactness as well as yield per vine when compared to control-untreated vines. However, no major differences were observed when both the treatments were applied in combination for Guyot or pergola although a higher reduction in yield was detected for Guyot and a significant increase in total soluble solids was observed in pergola. Our study suggests that intense leaf removal and gibberellic acid applied at early flowering can help reducing bunch compactness in Pinot gris and showing it in two training systems. In particular, leaf removal represents a valuable alternative to plant growth regulators (i.e., gibberellic acid) as applicable in organic viticulture.

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