Tolerance to Water Stress in Tomato Cultivars |
| |
Authors: | NK Srinivasa Rao RM Bhatt AT Sadashiva |
| |
Institution: | (1) Divisions of Plant Physiology and Biochemistry, Indian Institute of Horticultural Research, Hessaraghatta Lake, Bangalore, 560 089, India |
| |
Abstract: | The effects of plant water stress imposed at vegetative, flowering, and fruiting stages of four cultivars of tomato (Lycopersicon esculentum Mill.) on net photosynthetic rate (P
N), stomatal conductance (g
s), transpiration rate (E), osmotic adjustment, and crop water stress index (CWSI) were investigated. Osmotic adjustment was the highest in cv. Arka
Meghali, followed by cv. RFS-1. CWSI was lowest in cv. Arka Meghali and highest in cv. Pusa Ruby. Significant reduction in
g
s, E, and P
N was observed in all the cultivars. The maximum reduction in E was observed in cv. Arka Saurabh during the fruiting stage (62.4 %) and maximum reduction in P
N at the flowering stage in Pusa Ruby (53.1 %). Maximum P
N was observed in Arka Meghali under water stress. The values of internal CO2 concentration (C
i) did not follow the decrease in g
s which might be taken as an indication of mesophyll (non-stomatal) limitation to P
N. Magnitude of P
N decrease accompanying g
s reductions varied in the four cultivars. Arka Meghali which had highest rate of gas exchange efficiency (P
N/g
s) under water deficits can be recommended for rainfed cultivation.
This revised version was published online in August 2006 with corrections to the Cover Date. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|