Photosynthetic responses and proline content of mature and young leaves of sunflower plants under water deficit

被引：52

作者：

Cechin, I ^{[1
]}

Rossi, SC ^{[1
]}

Oliveira, VC ^{[1
]}

Fumis, TF ^{[1
]}

机构：

[1] Univ Sao Paulo, Fac Sci, Dept Biol, BR-17033360 Bauru, SP, Brazil

来源：

PHOTOSYNTHETICA | 2006年 / 44卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

chlorophyll; drought; intercellular CO2 concentration; leaf water potential; non-photochemical quenching; photochemical activity; rehydration; stomatal conductance to water vapour; transpiration rate;

D O I：

10.1007/s11099-005-0171-2

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

In mature and young leaves of sunflower (Helianthus annuus L. cv. Catissol-01) plants grown in the greenhouse, photosynthetic rate, stomatal conductance, and transpiration rate declined during water stress independently of leaf age and recovered after 24-h rehydration. The intercellular CO2 concentration, chlorophyll (Chl) content, and photochemical activity were not affected by water stress. However, non-photochemical quenching increased in mature stressed leaves. Rehydration recovered the levels of non-photochemical quenching and increased the F-v/F-m in young leaves. Drought did not alter the total Chl content. However, the accumulation of proline under drought was dependent on leaf age: higher content of proline was found in Young leaves. After 24 h of rehydration the content of proline returned to the same contents as in control plants.

引用

页码：143 / 146

页数：4

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