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MITIGATING WATER STRESS IN WHEAT BY FOLIAR APPLICATION OF PROLINE (Pages : 8 - 14)

FARHAD, M.G. KIBRIA, M.H. MIAN, Y. MURATA AND M.A. HOQUE

A field experiment was conducted to investigate the improvement of water stress tolerance in wheat by exogenous application of proline. Wheat cv. BARI Gom-24 was used as a test crop. The experiment was laid out in a split plot design with three replications. Treatment combinations were the different levels of irrigation and proline. There were four levels of irrigation, viz. I0- control (normal irrigations), I1- water stress at vegetative stage (irrigation missing at vegetative stage), I2- water stress at flowering stage (irrigation missing at flowering stage), and I3- water stress at vegetative and flowering stages (irrigation missing at both vegetative and flowering stages). There were three levels of proline (0, 25 and 50 mM) which were denoted as P0, P25 and P50. Irrigation and proline were considered as main plot and sub plot treatments, respectively. Water stress caused significant reductions in growth and yield of BARI Gom-24. This reduction was associated with decreased yield components. Water stress also decreased N, P, K and S uptake by wheat. On the other hand, exogenous application of proline resulted in a significant increase in growth, yield components, and grain and straw yields which were positively associated with increased uptake of N, P, K and S. The study showed that interaction effects of exogenous proline and water stress were significant in aspects of higher growth and yields and increased uptake of N, P, K and S in BARI Gom-24. Foliar application of 50 mM proline was found to be more effective in improving water stress tolerance. This study suggests that exogenous proline confers tolerance to water stress in wheat due to increasing nutrient uptake and probably increasing antioxidant defense systems as well.Download


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