NDLI: Adaptive Responses of Soybean and Cotton to Water Stress II. Changes in CO2 Assimilation Rate, Chlorophyll Fluorescence and Photochemical Reflectance Index in Relation to Leaf Temperature

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Adaptive Responses of Soybean and Cotton to Water Stress II. Changes in CO2 Assimilation Rate, Chlorophyll Fluorescence and Photochemical Reflectance Index in Relation to Leaf Temperature

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Adaptive Responses of Soybean and Cotton to Water Stress II. Changes in CO2 Assimilation Rate, Chlorophyll Fluorescence and Photochemical Reflectance Index in Relation to Leaf Temperature

Content Provider	Taylor & Francis Online
Author	Inamullah Isoda, Akihiro
Abstract	Adaptive changes were studied comparatively in soybean and cotton grown in pots under four irrigation conditions i.e. normal irrigation (equal to the evapotranspiration of the crop), and 50%, 25% and 10% of the normal irrigation. In soybean, the maximum quantum yield of PSII (Fv/Fm) was generally higher while the actual quantum yield of PSII (∆F/Fm’) and CO2 assimilation rate (An) were lower than in cotton.The intensity of the decrease in Fv/Fm, ∆F/Fm’ and An by water-stress treatments was larger in soybean than in cotton. The decrease in ∆F/Fm’ in soybean under water stress was accompanied by a significant increase in non-photochemical quenching (NPQ) and significant decrease in photochemical reflectance index (PRI). Chlorophyll content decreased significantly under severe water stress only in soybean. The increase in leaf temperature (Tl) in response to water stress was significantly larger in soybean than in cotton. Tl was highly and negatively correlated with Fv/Fm, An, PRI and ∆F/Fm’ while it was highly and positively correlated with NPQ of both crops. Especially in soybean, the correlations of Tl with An, Fv/Fm and PRI were significant. It was concluded that soybean adapted to water stress by dissipating the excess excitation energy thermally with the down-regulation of PSII activity to protect its photosynthetic apparatus from the photodamaging effect of water stress and high Tl. This photoprotective mechanism might be supported by the paraheliotropic leaf movement of the crop. Cotton adapted to water stress by keeping Tl lower to protect the photosynthetic apparatus from photodamage. Probably higher transpiration kept Tl of the crop lower under drought stress.
Starting Page	131
Ending Page	138
Page Count	8
File Format	PDF HTM / HTML
ISSN	1343943X 13491008
DOI	10.1626/pps.8.131
Journal	Plant Production Science
Volume Number	8
Issue Number	2
Language	English
Publisher	Taylor & Francis
Publisher Date	2015-12-03
Access Restriction	Open
Subject Keyword	Chlorophyll fluorescence >Glycine max (L.) Merr Gossypium hirsutum L Leaf movement Photoinhibition Photosystem II
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science

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Adaptive Responses of Soybean and Cotton to Water Stress: I. Transpiration Changes in Relation to Stomatal Area and Stomatal Conductance

A lack of response of irrigated soybean (Glycine max L. Merr.) in rotation with cotton (Gossypium hirsutum L.) in the Mississippi Delta, USA

Effects of rotation of cotton (Gossypium hirsutum L.) and soybean [Glycine max (L.) Merr.] crops on soil fertility in Elizabeth, Mississippi, USA

Off-target Movement of DGA and BAPMA Dicamba to Sensitive Soybean

Leaf Temperature and Transpiration of Field Grown Cotton and Soybean under Arid and Humid Conditions

Photochemical Efficiency of Photosystem II in Inverted Leaves of Soybean [Glycine max (L.) Merr.] Affected by Elevated Temperature and High Light

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Adaptive Responses of Soybean and Cotton to Water Stress II. Changes in CO2 Assimilation Rate, Chlorophyll Fluorescence and Photochemical Reflectance Index in Relation to Leaf Temperature

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