水分胁迫期间及胁迫解除后幼年桃树光合产物的分配

园艺学报 ›› 2004, Vol. 31 ›› Issue (5): 574-578.

水分胁迫期间及胁迫解除后幼年桃树光合产物的分配

柴成林¹;李绍华^1*;徐迎春¹;宋沅燮²

(¹中国科学院植物研究所, 北京100093;²韩国顺天大学植物科学及生产系, 顺天540-742)

收稿日期:2003-12-25 修回日期:2004-03-19 出版日期:2004-10-25 发布日期:2004-10-25
通讯作者: 李绍华

Assimilates Distribution in Young Peach Plants during Water Stress and afterRemoving Water Stress

Chai Chenglin¹;Li Shaohua^1*; Xu Yingchun¹; Song Wonseob²

(¹ Institute of Botany , Chinese Academy of Sciences , Beijing 100093 , China ; ² Department of Oriental Medicine Resources ,Sunchon National University , Sunchon 5402742 , Korea)

Received:2003-12-25 Revised:2004-03-19 Online:2004-10-25 Published:2004-10-25
Contact: Li Shaohua

摘要/Abstract

摘要： 采用¹⁴CO₂ 示踪技术, 研究了盆栽‘京春’桃( Prunus persica L. ) 树在水分胁迫期间和胁迫解除后光合产物在各器官间的分配。水分胁迫抑制源叶中同化产物的向外输出, 并且在水分胁迫解除后仍对同化产物的输出具有后效作用。水分胁迫显著降低了幼年桃树幼叶+ 梢尖的库活力( ¹⁴C - 光合产物分配系数K) 和¹⁴C - 光合产物相对分配量(R) , 但导致砧木韧皮部和细根K值和R 值的显著增加。在水分胁迫解除后11 d , 幼叶+ 梢尖K和R 值获得较大程度的恢复, 尽管仍低于对照, 但显著高于正处于胁迫状态的植株, 砧木韧皮部的K和R 值降低到对照的水平, 而细根的K值和R 值仍维持在显著高于对照的水平上。对水分胁迫对器官碳素营养的影响与其生长的反应的关系进行了讨论。

关键词: 桃, 水分胁迫, ¹⁴CO₂ 示踪技术, 光合产物分配

Abstract: Young peach plant s ( Prunus persica L. ) grown in pot s were studied to assess the effects of water stress on the distribution of assimilates among the organs during and after water stress by feeding leaves with ¹⁴CO₂ . Water st ress significantly inhibited the export of assimilates f rom the labeled leaves , and it s‘after effect’still existed after water st ress was removed. The dist ribution coefficient of ¹⁴C-assimilates ( K) of ¹⁴C-labeled shoot segment , shoot segment below ¹⁴C-labeled shoot segment increased during water
stress and remained the similar level even after removing water stress. During water stress , the K values and relative ¹⁴C-assimilate distribution (R) of young leaves and apex remarkably decreased while those of root stock phloem and fine roots significantly increased. After water stress was removed , the Kand R values were partly recovered in young leaves and apex , and they decreased to the cont rol level in root stock phloem.However the K and R values kept a same high level in fine root s after water st ress was removed as the water stressed plants. Moreover , the role of assimilate distribution on the organ growth response under water stress is discussed in this paper.

Key words: Peach, Water stress, ¹⁴C-assimilates, Distribution

中图分类号:

S 662.1

柴成林;李绍华;徐迎春;宋沅燮. 水分胁迫期间及胁迫解除后幼年桃树光合产物的分配[J]. 园艺学报, 2004, 31(5): 574-578.

Chai Chenglin;Li Shaohua;Xu Yingchun;Song Wonseob. Assimilates Distribution in Young Peach Plants during Water Stress and afterRemoving Water Stress[J]. ACTA HORTICULTURAE SINICA, 2004, 31(5): 574-578.

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