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Doctorat
Inde
1980-1989
Studies on drought physiology accumulating metabolites and water balance
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
Page publiée le 17 février 2021