Comparing potential of GA and 2, 4-D in increasing fruit yield from Jatropha curcas

Vijay Makwana, Purna R Shukla, P. Robin
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引用次数: 5

Abstract

Jatropha curcas L. has been accepted world wide as a plant with tremendous commercial importance as a source for biodiesel. It is a monoecious plant with staminate and pistillate flowers on same inflorescence. The number of staminate flowers is higher than pistillate ones resulting in very low fruit yield. Altering the sex ratio, to increase number of female flowers would lead to better yield. Phytohormones are one of the most important factors known to alter sex ratio in plants. The mechanism by which phytohormones alter sex ratio differs in different plant species. Earlier studies from our laboratory have shown effect of exogenous application of GA and 2, 4-D on flowering patterns in Jatropha. Here we report a comparative study of the effect of exogenous application of GA and 2, 4-D (50 and 100 ppm) on flower sex modification in Jatropha curcas. There was considerable increase in total number of flowers and female: male flower ratio by application of GA and 2, 4-D. However, at higher concentration of GA a negative result as far as fruit yield is considered was seen. The reasons for this are reported here. 2, 4-D on the other hand increased the ratio of female flowers in a concentration dependent fashion. Of the four treatments reported here, we have observed that 2, 4-D (100 ppm) shows better results than GA and untreated plants. The reasons for this are discussed.
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GA与2,4 - d对麻疯树果实增产潜力的比较
麻疯树(Jatropha curcas L.)作为一种具有巨大商业价值的生物柴油原料已被全世界所接受。它是一种雌雄同株的植物,雄蕊花和雌蕊花在同一花序上。雄蕊花的数量比雌蕊花多,结果产量很低。通过改变性别比,增加雌花数量,提高产量。植物激素是影响植物性别比的重要因素之一。植物激素改变性别比的机制在不同的植物种类中是不同的。我们实验室早期的研究显示了外源施用GA和2,4 - d对麻疯树开花模式的影响。本文比较研究了外源施用GA和2,4 - d(50和100 ppm)对麻疯树花变性的影响。施用GA和2,4 - d可显著提高花总数和雌雄花比。然而,在较高的GA浓度下,就果实产量而言,出现了负面结果。这里报告了其原因。另一方面,2,4 - d增加雌花的比例呈浓度依赖性。在这里报道的四种处理中,我们观察到2,4 - d (100 ppm)比GA和未经处理的植物表现出更好的结果。对其原因进行了讨论。
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