Informatics Publishing Limited

G. S. R. Murti ¹, K. K. Upreti ¹

Affiliations
1 Division of Plant Physiology and Biochemistry, Indian Institute of Horticultural Research, Hessaraghatta Lake P.O., Bangalore - 560 089, IN

Abstract

The present review provides an insight into the relationship between plant growth regulators and water stress with emphasis on metabolic events that regulate growth regulator balance and physiological responses. Possible mechanisms by which ABA controls stomatal function and growth under stress, and interacts with proteins and important osmo-protectants, have been discussed. ABA involvement in signal transduction and ischolar_main-shoot communication through its effects on gene and gene products is also included. A brief description of involvement of other growth regulators such as cytokinins, ethylene, polyamines and brasssinosteroids in water stress tolerance is also provided. Salient achievements in exploiting the potential of growth regulators in the resistance to water stress in some horticultural crops are also given. Gaps in existing information on plant growth regulator research in water stress tolerance have been summarized.

Keywords

Abscisic Acid, Brassinosteroids, Cytokinins, Ethylene, Polyamines, Water Stress.

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J. Satisha ¹, G. S. Prakash ², G. S. R. Murti ³, K. K. Upreti ³

Affiliations
1 National Research Centre for Grapes, P.B. # 3, Manjari Farm, Solapur Road, Pune-412 307, IN
2 Division of Fruit Crops, Indian Institute of Horticultural Research, Bangalore-560 089, IN
3 Division of Plant Physiology and Biochemistry, Indian Institute of Horticultural Research, Bangalore-560 089, IN

Abstract

Studies on ischolar_main and shoot morphology, endogenous hormones and water use efficiency in five grape ischolar_mainstocks namely Dogridge, 1613 C, Salt Creek, St. George and Vitis champinii clone (VC Clone) at three levels of moisture stress viz., no stress (100% irrigation), 50% stress (50% irrigation) and 100% stress (without irrigation) for 14 days revealed that Dogridge and Salt Creek ischolar_mainstocks maintained the highest ratios of ischolar_main to shoot length and ischolar_main to shoot dry weight as compared to other ischolar_mainstocks. Water use efficiency increased with increased soil moisture stress and was the highest in Dogridge and Salt Creek. The abscisic acid content in the leaves of Dogridge was maximum at 50% stress followed by that of Salt Creek. Similarly the cytokinin content (both t-ZR and DHZR) was minimum in Dogridge and Salt Creek at 50% stress while it was maximum in 1613 C and St.George. The ischolar_main to shoot length ratio was positively correlated with ABA content under moisture stress conditions. The higher levels of abscisic acid content in Dogridge and Salt Creek under soil moisture stress suggested their better drought tolerance capacity through a reduction of stomatal conductance and increased water use efficiency.

Keywords

ABA, Cytokinins, Grape Rootstocks, Root to Shoot Length Ratio, Root to Shoot Dry Weight Ratio, Water Use Efficiency.

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