Effects of Photoperiod on Alternative Respiration Pathway in Nectarine Flower Buds During Dormancy Induction

Agricultural Sciences in China Pub Date : 2011-12-01 DOI:10.1016/S1671-2927(11)60188-0

Dong-mei LI , Yue TAN , Qin YU , Xiu-de CHEN , Ling LI , Hai-sen ZHANG , Dong-sheng GAO

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引用次数: 2

Abstract

Characteristics of dormancy induction and alternative respiration pathway (also known as cyanide-resistant respiration) of nectarine flower buds in different photoperiods were studied to determine the function of photoperiod and alternative respiration pathway in dormancy induction. Oxygen-electrode system and respiratory inhibitors were used to measure total respiratory rates and rates of alternative respiration pathway. The results showed that total respiration rate (V_t) in flower buds showed to be double hump-shaped curves. Short day raised, brought the first-hump of V_t forward and delayed the second-hump, while long day delayed the whole curve. The capacity (V_alt) and activity (ρV_alt) of SD and LD changed synchronously and both showed to be double hump-shaped curves. Short day made the first climax of V_alt and pV_alt existed much earlier, while long day increased their rates significantly. The length of day had little effects on the later period climax. Long day also increased the contributions of alternative respiration pathway in total respiration rate (ρV_alt/V_t). The changes in alternative respiration pathway were correlated with the induction of dormancy and adjusted by photoperiod. Short day promoted dormancy induction of nectarine trees, while long day delayed it.

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光周期对油桃花蕾诱导休眠过程中呼吸途径的影响

摘要研究了不同光周期油桃花蕾诱导休眠和替代呼吸途径(又称抗氰呼吸)的特征，探讨了光周期和替代呼吸途径在油桃花蕾诱导休眠中的作用。使用氧电极系统和呼吸抑制剂测量总呼吸速率和替代呼吸途径速率。结果表明，花蕾总呼吸速率(Vt)呈双驼峰型曲线。昼短昼高，使Vt的第一个驼峰前进，使第二个驼峰推迟，而昼长则使整个曲线推迟。SD和LD的容量(Valt)和活性(ρValt)同步变化，均呈双驼峰型曲线。较短的日照使其第一次高潮出现得更早，而较长的日照则显著提高了其出现率。白天长度对后期高潮影响不大。长日也增加了替代呼吸途径对总呼吸速率(ρValt/Vt)的贡献。交替呼吸途径的变化与休眠诱导有关，并受光周期调节。短日照促进油桃休眠诱导，长日照延缓油桃休眠诱导。

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Agricultural Sciences in China AGRICULTURE, MULTIDISCIPLINARY-

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3.2 months