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Abstract Detail


Physiological Section

Parida, Asish Kumar [1], Dagaonkar, Vipin. S. [1], Phalak, Monoj S. [1], Umalkar, G. V. [2], Aurangabadkar, L. P. [2].

Alterations in photosynthetic pigments, protein and osmotic components in cotton genotypes subjected to short-term drought stress followed by recovery.

IN order to assess drought tolerance mechanism in cotton, short-term drought induced biochemical responses were monitored in two cotton (Gossypium hirsutum L.) genotypes contrasting to their tolerance to water deficit. The seeds of two genotypes namely, GM 090304 (moderately drought tolerant) and Ca/H 631 (drought sensitive) were sown in pots containing soil, sand and peat in the ratio of (1:1:1) and irrigated at every alternate day up to 75 d after sowing. After 75 d of sowing, each genotype was subjected to a cycle of water stress by withholding irrigation for 7 d. The stress cycle was terminated by rewatering the stressed plants for 7 d. The levels of biochemical components such as chlorophylls, carotenoids, total protein, free proline, total free amino acids, sugars, starch and polyphenols were measured during stress as well as recovery periods. The chlorophylls, carotenoids, protein and starch contents decreased in drought stressed plants as compared to control and tent to increase when the plants were recovered from stress. The degree of decrease in chlorophylls, carotenoids and protein contents under drought was higher in sensitive genotype (Ca/H 631) as compared to moderately tolerant genotype (GM 090304). However, proline, total free amino acids, total sugars, reducing sugars and polyphenol contents were increased in drought stressed plants and tent to decrease during period of recovery. Drought induced increase in total free amino acids, proline and sugars were significantly higher in sensitive genotype (Ca/H 631) than moderately tolerant genotype (GM 090304). These results suggest that proline, sugars and polyphenols act as main compatible solutes in cotton in order to maintain osmotic balance, to protect cellular macromolecules, to detoxify the cells, and to scavenge free radicals under water stress condition.


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1 - Ankur Agricultural Research Laboratory, Biotechnology Division, 27, New Cotton Market Layout, Nagpur, MAHARASHTRA, 440018, INDIA
2 - Ankur Agricultural Research Laboratory, Genetics & Plant Breeding, 27, New Cotton Market Layout, Nagpur, MAHARASHTRA, 440018, INDIA

Keywords:
Carotenoids
chlorophylls
compatible solutes
drought
osmolytes
polyphenols
proline.

Presentation Type: Poster:Posters for Sections
Session: 48-107
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:112


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