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Accueil du site → Doctorat → Pakistan → EVALUATION OF HEAT TOLERANCE POTENTIAL AND ITS ENHANCEMENT IN OKRA (ABELMOSCHUS ESCULENTUS L. MOENCH).

University of Agriculture, Faisalabad (2016)

EVALUATION OF HEAT TOLERANCE POTENTIAL AND ITS ENHANCEMENT IN OKRA (ABELMOSCHUS ESCULENTUS L. MOENCH).

HUSSAIN, RASHID

Titre : EVALUATION OF HEAT TOLERANCE POTENTIAL AND ITS ENHANCEMENT IN OKRA (ABELMOSCHUS ESCULENTUS L. MOENCH).

Auteur : HUSSAIN, RASHID

Université de soutenance : University of Agriculture, Faisalabad

Grade : Doctor of Philosophy (PhD) in Horticulture 2016

Résumé partiel
Lady’s finger or Okra is a member of family malvacae. It is multipurpose crop ; its fibrous tender fruits called pods are used as vegetable ; seeds, stem and roots used for industrials purposes. In past it was considered as minor crop and no care was taken for its improvement at national and international level in research programs. It grows well at temperature ranges of 18 to 35oC and gives highest yield. Heat and drought events will be intensified due change in climate, activating modifications in the ecosystem and failure or low productivity of crops which are prone to abiotic stresses and same case is with okra. Major constraint which affects vegetative and reproductive phase of okra is heat stress. Heat stress damage quality as well as yield of okra. The research was conducted with the aim to screen out genetically diverse and improved germplasm while eradicating physiological and genetic basis of better adaptation under thermal stress and enhancement of heat tolerance by foliar application of proline. In first experiment comparative performance of one hundred okra genotypes was investigated under heat stress condition. For this purpose one hundred (100) okra genotypes were grown under control environmental conditions of high temperature 45/35°C (day/night). Data for morphological attributes (root length, shoot length, shoot and root fresh weight, number of leaves and root and shoot dry weight) and physiological attributes (transpiration rate, stomatal conductance to water, photosynthetic rate, leaf surface temperature, chlorophyll contents, sub-stomatal CO2 and water use efficiency) was recorded. According to recorded data genotypes were classified on the basis of their performance against heat stress conditions. Under heat stress conditions genotypes showed significant different response and genotypes were divided into heat sensitive and heat tolerant ones. VI051062 and VI060131 were categorized as most heat tolerant and VI046554, while VI048594 were categorized as most heat sensitive ones. In second experiment twenty five okra genotypes screened out from one hundred okra genotypes in experiment # 1 in growth room, (twenty heat tolerant and five heat sensitive genotypes) were sown in summer 2014, in the field conditions at vegetable research area of Institute of Horticultural Sciences, University of Agriculture, Faisalabad. Genotypes were sown at three different sowing dates (02, April, 12, April and 22, April) to check the effect of heat stress on different morpho-physiological and yield attributes. All the cultural practices were kept same for all sowing dates and for all genotypes.

Présentation (Pakistan Research Repository)

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