Abstract
A pot experiment was conducted at Bangladesh Agricultural University to evaluating the effect of exogenous application of proline on the growth and yield of rice under salt stress condition. There were six treatments including T1 (Control), T2 (25 mM NaCl), T3 (50 mM NaCl), T4 (25 mM NaCl + Proline), T5 (50 mM NaCl + Proline) and T6 (Proline). A salt sensitive variety of rice (cv. BRRI dhan29) was used as a test crop. Salinity (NaCl) was induced at vegetative growth stage (35 days after transplanting) of rice. Proline of 25 mL plant-1 was applied as foliar on the same day of NaCl treatment. All plants virtually died when they were treated with 50 mM NaCl (T3). On the other hand, foliar application of proline resulted in a significant increase in plant growth parameters of rice. The grain and straw yields plant-1 decreased with increased salinity levels. When the salt treated plants were supplied with exogenous proline, they produced significant amount of grain and straw yields. Sodium content and uptake by plants were decreased with foliar application of proline. It can be concluded that salt stress in rice reduce to a significant extent due to the exogenous application of proline.
Highlights
Rice (Oryza sativa L.) is a staple food for more than half of the world’s population
Yield Contributing Characters The plant height, root growth, effective tillers plant-1, panicle length, filled grains panicle-1, unfilled grains panicle-1, 1000-grain weight of BRRI dhan29 was significantly influenced by the foliar application of proline under different salt stress conditions (Table 2)
The highest number of effective tillers plant-1 (11.00) was recorded at T1 (Control) which was similar with T6 (Proline) and no effective tiller was found when plants were exposed to 50 mM NaCl stress (T3)
Summary
Rice (Oryza sativa L.) is a staple food for more than half of the world’s population. It is imperative to increase rice production in different rice growing ecosystems to feed the increasing world population [15]. It is staple food for about 142 million people in Bangladesh. The total area and production of rice in Bangladesh are about 11.7 million hectares and 31.94 million metric tons, respectively [4]. Agro-climatic condition in Bangladesh is favorable for rice cultivation, rice production is being hampered in some areas of the country due to adverse situation such as salinity problem in coastal area of the country. Salinity is the second most widespread soil problem in rice growing countries after drought and is considered as a serious constraint to increase rice production worldwide [8]
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