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水稻光合关键酶类在光合日变化中的作用
引用本文:蒋德安,陆庆,翁晓燕,郑炳松,奚海福. 水稻光合关键酶类在光合日变化中的作用[J]. 作物学报, 2001, 27(3): 301-307
作者姓名:蒋德安  陆庆  翁晓燕  郑炳松  奚海福
作者单位:浙江大学生命科学学院杭州华家池 310029
基金项目:This research waswupported by the National Natural Science Foundation(No.39570432)
摘    要:研究了2个水稻品种的剑叶净光合速率(Pn)、Rubisco初始活力和Rubisco活化酶活力、Rubisco活化酶含量和ATP含量的日变化,以明确在体内Rubisco活化酶是否对光合作用和Rubisco活力的日变化起调节作用。结果表明,2个品种剑叶的Pn、Rubisco初始活力和Rubisco活化酶活力在一天内变化较大,三者的日变化模式基本一致,即具有两个峰

关 键 词:水稻  光合速率  日变化  Rubisco  Rubisco活化酶, ATP
收稿时间:1999-12-16
修稿时间:1999-12-16

Role of Key Enzymes for Photosynthesis in the Diurnal Changes of PhotosyntheticRate in Rice
JIANG De An LU Qing WENG Xiao Yan ZHENG Bing Song XI Hai Fu[WTBX]. Role of Key Enzymes for Photosynthesis in the Diurnal Changes of PhotosyntheticRate in Rice[J]. Acta Agronomica Sinica, 2001, 27(3): 301-307
Authors:JIANG De An LU Qing WENG Xiao Yan ZHENG Bing Song XI Hai Fu[WTBX]
Affiliation:JIANG De An LU Qing WENG Xiao Yan ZHENG Bing Song XI Hai Fu[WT6BX]
Abstract:The diurnal variations of net photosynthetic rate (P n), activities of Rubisco and Rubisco activase (RCA) as well as RCA and ATP contents in flag leaves of two cultivars were measured to explore the possible effect of Rubisco activase in diurnal changes of P n and rubisco activation. The results showed that P n, initial Rubisco and RCA activities arose the typical pattern with two peaks in the morning and afternoon, respectively, and a midday depression at noon. However, RCA and ATP contents were markedly low in the morning than in the afternoon. Regression analysis indicated that P n was very significantly correlative to initial Rubisco activity during the day, but only correlated with RCA activity in the morning upon P n increasing and in the afternoon upon P n decreasing. It suggested that the midday depression of P n was involved in losing of the initial Rubisco activity. RCA activity correlated with ATP content only in early morning when ATP content was lower, but not at noon and in late afternoon when ATP content was higher. But RCA content increased slowly with increasing ATP content in early morning and did fast at noon and in the afternoon, implying that in vivo ATP might be involved in not only activation but also synthesis of RCA or/and protect the enzyme from degradation.
Keywords:Rice   Photosynthetic rate   Rubisco   Rubisco activase   Diurnal change  
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