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Accueil du site → Master → Inde → 2007 → Mitigation of drought stress through plant growth regulators and vesicular arbuscular mychorrizae (vam) in cotton (gossypium hirsutum)

University of Agricultural Sciences, Dharwad (2007)

Mitigation of drought stress through plant growth regulators and vesicular arbuscular mychorrizae (vam) in cotton (gossypium hirsutum)

Roopa S.Havargi

Titre : Mitigation of drought stress through plant growth regulators and vesicular arbuscular mychorrizae (vam) in cotton (gossypium hirsutum)

Auteur : Roopa S.Havargi

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Master of Science in Crop Physiology 2007

Résumé
The present investigation was carried out during kharif, 2006-07 with seed priming through plant growth regulators (GA3, CK and CCC) and VAM (Vesicular Arbuscular Mycorrhiza) tested under three levels of moisture stress i.e. 100 %, 70 %, 50 % field capacity in Gossypium hirsutum cv. LRA 5166 to mitigate the drought stress. Under severe moisture stress condition, germination decreased by 60 per cent while application of VAM enhanced germination by 25 per cent. Root and shoot length and seedling vigour index reduced with increase in moisture stress. These parameters enhanced considerably with VAM application to soil. While, root : shoot ratio was minimum (19.5%) in VAM treatment compared to other treatments. Total chlorophyll content and its fractions decreased with an increase in moisture stress. In general, VAM treatment and seed priming with CCC showed lesser reduction in total chlorophyll and its fractions followed by the kinetin and GA3 treatments. Free proline content increased in all the treatments with an increase in moisture stress. The treatment VAM and CCC further enhanced the accumulation of proline under increased moisture stress. The reducing sugar increased in all the treatments with an increase in the moisture stress. The treatment VAM and CCC accumulated more reducing sugar irrespective of moisture levels. The peroxidase activity was maximum at 65 DAS and with increase in moisture stress the peroxidase activity increased. Among the treatments, VAM and CCC showed higher activity at both the stages followed by kinetin and GA3. Relative water content (RWC) indicated significant differences due to plant growth regulators and VAM and it was higher in the treatment VAM and CCC followed by kinetin and GA3. Moisture stress reduced the seed cotton yield and yield components (number of bolls and boll weight) and among the treatments, VAM recorded significantly higher seed cotton yield, higher number of good opened bolls and higher boll weight at all the moisture stress levels compared to other treatments.

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