Physiology of maize (Zea mays L.) genotypes under moisture stress condition
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Date
2014
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Rajendra Agricultural University, Pusa (Samastipur)
Abstract
The present investigation was planned and carried out during the period 2012-2013 during Rabi season at T.C.A, Dholi, Research farm, R.A.U., Pusa in Randomize block design with three replication. Altogether twelve genotypes of maize namely Shaktiman-3, Rajendra Hybrid Maize-1 ,Rajendra Hybrid Maize-2 Rajendra Hybrid Maize-3 Shaktiman-1, Lakshmi, Devki, Shaktiman-4 ,DHM-117, MHQPM- 09- 8, Rajendra hybrid Maize Deep Jwala, Shaktiman-2 were sown in stress and control conditions.
Based on the anthesis silking interval and yield against moisture stress, tolerant/susceptible maize genotypes were screened. Devki and shaktiman-4 were identified as tolerant, whereas Lakshmi and Shaktiman-1 were found susceptible genotypes .The physiological parameters like root length, root volume, leaf area index (LAI), plant height, and yield parameters like no. of cobs/plot, No. of lines/cob, 1000-grain weight and yield (q/ha) decreased in moisture stress expect root length at both tasseling and silking stage. Tolerant genotypes were significantly superior to susceptible genotypes with regard to all physiological, biochemical, enzymatic and yield parameters at both stage. Among the biochemical parameters, sugar and proline content increased in moisture stress in all the genotypes at both stages.
Correlation co-efficient values (r) between yield (q/ha) and all parameters in moisture stress were determined. All parameters studies in control condition were found negatively correlated but positively correlated in stress condition at both tasseling and silking stage.
Among the positively correlated parameters, protein (0.913*), protease activity (0.923*) and peroxidase activity (0.900*) were found significant at silking stage. Also protease activity (0.938*) and peroxidase activity (0.940*) were significant at tasseling stage. Whereas proline correlation value (0.990**) at tasseling and (0.977**) at silking stage were highly significant. Some of these parameters might prove useful for screening tolerant genotypes for improving maize genotypes against moisture stress.
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