9-2-4 RESPONSE OF LOCAL AND MODERN T. AMAN RICE VARIETIES TO DROUGHT STRESS: I. VEGETATIVE GROWTH


Md. Jafar Ullah* and Ismat Jahan Tuhin
*Corresponding author, Email address: jafarullahsau@gmail.com
Abstract
An experiment was conducted at the Sher-e-Bangla Agricultural University during June through December 2014 to study the performance of local and modern transplanted rainy season rice varieties under drought stress condition. The experiment comprised 16 varieties; four modern (BRRI dhan34, BRRI dhan33, BRRI dhan62 and BU dhan1) and twelve local varieties (Kartik Shail, Doodh Kalam, Nakhuchi Mota, Kartik Balam, Lal Mota, Kalo Khaia, Changshai, Basmati Shakkar Khanna, Dholi Chikon, Ghashful Chikon, Moulata). Two experiments were set; one in pot (stressed condition) in completely randomized design, while another in a field following a randomized completely block design under non-stressed condition. Stress condition was imposed providing water in the pot when soil of the pots dried and plants showed wilting symptoms. Each treatment was replicated three times. In stressed condition, significantly longest plants (139.50 cm) were found in Kartik Balam and Basmati Shakkar Khanna while highest number of tillers hill-1 (20.33). In non-stressed condition, Rani Salute showed the highest number of leaves hill−1 at 45 DAT (10.67 and 71.67, respectively). On the other hand, in stressed condition, at 45 DAT, Moulata produced maximum leaves hill−1(70.00), which was statistically similar with DholiChikon, KaloKhaia and Changshai (69.33, 66.67 and 66.33, respectively). Highest straw dry weight (20.98 t ha-1) was found in Moulata. In non-stressed condition, the longest plants (184.83 cm) were found in Kalo Khaia and highest number of total tillers hill-1 (17.67) in BU Dhan 1. On and average, the local varieties under stressed and nonstressed condition had straw dry matter per hill of 66.01 and 82.37 g, respectively. The corresponding values for the improved varieties were 32.96 and 46.93 g, respectively. The modern ones showed more reductions (29.76%) than the local varieties (19.86%) due to the stress condition.


Key words: Local rice, modern rice, T. aman rice and drought stress.
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J. Expt. Biosci.9(2) July 2018

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