Paper Details

Some physiological responses of mung-bean at different plant densities to water deficit

Kazem Ghassemi-Golezani, Salar Farhanghi Abriz, Sirous Hassannejad, Saeid Hassanpour-Bourkheili

DOI: https://dx.doi.org/10.12692/ijb/4.12.19-26

Int. J. Biosci. 4(12), 19-26. June, 2014. (PDF)

Abstract:

A large part of the surface of the world is arid. Water deficit is the major abiotic factor limiting plant growth and crop productivity around the world. A field experiment was carried out as split plot based on RCB design with three replications in 2013 to assess the effects of different irrigation treatments (I1, I2, I3, I4 for irrigation after 70, 100, 130 and 160 mm evaporation from class A pan, respectively) and different plant densities (D1, D2 and D3 with 30, 50 and 70 plants/m2) on some physiological traits and grain yield of mung-bean. Leaf area index, chlorophyll fluorescence of the PSII (Fv/Fm) and grain yield significantly decreased as water deficit increased. LAI was statistically similar under I3 and I4. LAI increased with increasing plant density up to 50 plants/m2,with no significant change thereafter. Leaf temperature significantly increased with increasing plant density under severe water stress (I4), however no significant differences among densities were observed under I1, I2 and I3. Fv/Fm slightly, but not significantly, decreased as plant density increased. Increasing leaf temperature and decreasing Leaf area index (LAI) and photosystem efficiency under water stress led to significant reduction in grain yield per unit area. The highest grain yield was obtained at 50 plants/m2.