Development and seed number in indeterminate soybean as affected by timing and duration of exposure to long photoperiods after flowering
Development and seed number in indeterminate soybean as affected by timing and duration of exposure to long photoperiods after flowering
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DOI：
10.1093/aob/mcm033
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发表时间：
2007-05-01
期刊：
影响因子：
4.2
通讯作者：
Slafer, Gustavo A.
中科院分区：
文献类型：
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作者：
Kantolic, Adriana G.;Slafer, Gustavo A.
背景与目的大豆从开花到成熟期长的光周期可以延缓大豆的生殖发育，增加单位面积的种子数。本研究旨在评估开花后对光周期的敏感性(A)是否与长日照的时间长短有关，以及(B)是否持续整个结荚期间。方法以成熟度不定的V类大豆品种为材料，进行了两个田间试验，试验1从结荚始期(R3)开始的不同天数(R3)开始，在不同的天数内进行比自然日长长2 h的光周期处理，而在试验2中，从R3到R6(全粒期)的不同时间开始连续9天进行光周期延长。从R3到R5(种子开始生长)的长光周期暴露增加了R3-R6的持续时间，而不考虑暴露的时间。R3-R6阶段的发育阶段由于电流以及之前暴露在长日的环境中而延迟。种子数与R3-R6的持续时间呈正相关，与长光周期的时间和时间无关。结论在生殖生长期，种子对光周期的敏感度很高，并与产量的产生过程高度正相关。
Background and Aims Long photoperiods from flowering to maturity have been found to delay reproductive development in soybean (Glycine max) and to increase the number of seeds per unit land area. This study was aimed to evaluate whether sensitivity to photoperiod after flowering (a) is quantitatively related to the length of exposure to long days and (b) persists throughout the whole pod-setting period. It was also evaluated whether seed number was related to changes in the duration of post-flowering phenophases.Methods Two field experiments were conducted with an indeterminate cultivar of soybean of maturity group V. In expt 1, photoperiods 2 h longer than natural daylength were applied during different numbers of days from the beginning pod stage (R3) onwards, while in expt 2 these photoperiod extensions were imposed during 9 consecutive days starting at different times between R3 and R6 (full seed) stages.Key Results There was a quantitative response of development to the number of cycles with a long photoperiod. The exposure to long photoperiods from R3 to R5 (beginning of seed growth) increased the duration of R3-R6 regardless of the timing of exposure. The stages of development comprised in the R3-R6 phase were delayed by current as well as by previous exposure to long days. A positive relationship was found between seed number and the duration of R3-R6, irrespective of the timing and length of exposure to the long photoperiod.Conclusions Sensitivity to photoperiod remained high during the reproductive period and was highly and positively coupled with the processes of generation of yield.