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Metabolic Alterations Associated with Water Stress at Critical Growth Stages in Rabi Sorghum Mulla M S, Munjal S V, Satbhai R D*, Naik R M Department of Biochemistry, Mahatma Phule Krishi Vidyapeeth, Rahuri-413 722, India *Corresponding author-(E-mail: abhiyadnee@rediffmail.
Abstract Artificial stress induced by withholding irrigation water at critical growth stages in rabi sorghum cultivars in a pot culture experiments led to an increase in the contents of proline and reducing sugars, however in vivo nitrate reductase activity declined. The proline content increased significantly in all the six cultivars with the corresponding decline in RLWC. Proline accumulation was highest at seedling stage and declined at later growth stages. Higher leaf proline accumulation in Mauli, CSV-14R and Sel-3 and minimum decline in in vivo NR activity and non-reducing sugars under both minus and plus KNO3 assays under control as well as under stress condition suggested tolerance of these cultivars under stress at various growth stages. The cultivars such as Phule Yashoda, Swati and SPV-86 recorded maximum reduction in in vivo NR activity and also comparatively lower accumulation of proline and hence are categorized as susceptible ones. Top Key words Sorghum, water stress, free proline, in vivo NR activity, critical growth stages, reducing sugars, RLWC. Top | |
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