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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Mar 2017, 38 (2)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Plant growth and foliar characteristics of faba bean (Vicia faba L.) as affected by indole-acetic acid under water-sufficient and

water-deficient conditions

 

A. Husen1, M. Iqbal2* and I.M. Aref3

1Department of Biology, College of Natural and Computational Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia

2Department of Botany, Faculty of Science, Jamia Hamdard, Hamdard Nagar, New Delhi-110 062, India

3Department of Plant Production, College of Food and Agricultural Sciences, King Saud University, P.O. Box 2460, Riyadh, Saudi Arabia

*Corresponding Author E-mail: iqbalg5@yahoo.co.in

 

 

Key words

Drought stress,

IAA application,

Net photosynthetic rate,

PSII efficiency,

Water status

 

 

 

Publication Data

Paper received: 21.01. 2016

Revised received: 26. 04.2016

Re-revised received: 29.07.2016

Accepted: 13.09.2016

 

Abstract

Aim: As water is crucial for survival, growth and yield of plants, it is highly desirable to devise strategies for enhancing drought tolerance in plants. This study investigates the impact of foliar application of indole acetic acid (IAA) on plant growth and leaf characteristics of faba bean (Vicia faba L.) under normal and water-deficit conditions in order to determine its role in drought resistance of plants.

?

Methodology: In a pot experiment, 4-week-old seedlings were sprayed daily with IAA (0, 15, 30 and 45 mg l-1) for 15 days. These seedlings were then maintained under (a) regular watering with 100% field capacity, and (b) water stress created by stopping watering for 5 days. Fifty-day-old seedlings were sampled for analyzing the growth, water content and photosynthetic parameters by standard methods.

 

Results: Water-deficit condition reduced plant growth, dry mass production, pigment concentration, maximum quantum yield of PSII (Fv/Fm), stomatal conductance (gs), net photosynthetic rate (Pn), transpiration rate (E) and relative water content (RWC). IAA application enabled the plants to withstand water stress and reduced the expected loss by about 18% in root length, 7% in shoot length, 10% in basal stem diameter, 11% in number of branches, 3% in number of leaves, 20% in leaf length, 22% in leaf area, 48% in root dry mass, 34% in stem dry mass and 26% in leaf dry mass. The loss was also mitigated by 44% in chl a, 39% in chl b, 60% in carotenoids, 9% in Fv/Fm, 36% in gs, 63% in Pn, 35% in E and 52% in RWC of the leaf.

 

Interpretation: Water-deficit hindered the vegetative growth of seedlings by affecting adversely the dry-mass production, photosynthetic pigments, gaseous exchange, photochemical efficiency and water status of plants, while IAA application promoted these parameters not only in normal but also in water-stressed conditions. The 45 mg IAA l-1dose proved to be most effective. 

 

 

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