Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Studies on drought physiology accumulating metabolites and water balance

Auteur : Sharma, Uma Devi

Université de soutenance : Himachal Pradesh University

Grade : Doctor of Philosophy (PhD) 1987

Résumé
The present study’ attempts following aspects 1. A ttempts have been made to study the effect of exogenous amino aeids on the permeability of plant mEillbrenes to water us1bg potato tuber t1seue. 2. Secondly . we have ellalDined in detail how the exogenous amine acids aUeet the stcmatal open1rJg 1ft model syst • using both epidermal strips as well as infiltrated leaves. 3. Alterations 1ft stomatal aperture results 1n altered stomatal diftusive resistance (SDR), a parameter d1 ct1y related to tel’ loss from leaves. This bas also been measured to substantiate’ the role ot amino aeida 1ft regulating the etGDatal trsnsp1re.tlon rate. 4. ABA, which accumulates very .fa8t under stress conditions causes stOtlllta to close. Therefore t .tn1:eract !ons between ABA and amino acids have also been studied on stoma tal opening and SDR of leaYe8.  Above experiments were pla:nned using exogenous amino aoids, as a replacement tor endogenously aecuDl,lat1rlg amino acids under drought. But whether aims J as- effects could be available with drrught itself. \’18S’ also checked by closing stomata under osmotic stress 8l’id then obser’ling the e.ftects of exogenous amino acids on it. 6. It 1s known that .in the opening and closing of stomata, potassium fluxes play .important ro1es. Theretore, potassium fluxes have : also been measured 8S affeoted. by osmotJ.eum, ABA and am1no acids.

Mots clés : Drought physiology, Accumulating metabolites, Water balance, Exogenous amino

Présentation et version intégrale (Shodhganga)