%0 Journal Article
%T SOWING DATE MEDIATED HEAT STRESS AFFECTS THE LEAF GROWTH AND DRY MATTER PARTITIONING IN SOME SPRING WHEAT (TRITICUM AESTIVUM L.) CULTIVARS
%A Kamal Uddin Ahamed
%A Kamrun Nahar and Masayuki Fujita
%J The IIOAB Journal
%D 2010
%I Institute of Integrative Omics and Applied Biotechnology (IIOAB)
%X To observe the effect of high temperature stress on the leaf growth and dry matter partitioning of 5 wheat varieties (Sourav, Pradip, Sufi, Shatabdi and Bijoy) a field experiment was conducted with normal sowing (sowing at November 30) and late sowing (sowing at December 30) at the research field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh. It was observed that stem dry weight was highest in Shatabdi under both normal (2.267 g) and heat stressed (1.801 g) environment and Pradip (1.202 g) and Sufi (1.166 g) produced the lowest stem dry weight in those conditions. Leaf number of Pradip (5.37) and Shatabdi (5.01) was the highest in the normal and late sowing condition, respectively and it was lowest in the variety Bijoy (4.87) followed by Sufi (3.62) under the normal and late sowing condition. Both under normal and late sown heat stressed condition the variety Shatabdi showed the highest leaf area, longest leaf sheath and lamina with concomitant increase of dry matter (5.976 g and 4.459 g tiller-1 under normal and heat stress, respectively). However, the spike dry weight was highest in Bijoy and lowest was in Sourav and Sufi regardless the growing condition. In normal sowing the ear weight and husk of main stem was the highest in Shatabdi (2.933 g), whereas seed weight per main stem was highest in Bijoy (2.167 g). In late sown condition, ear weight, seed weight per stem was highest in Bijoy and husk wt. was found the highest in Shatabdi. Grain weight of variety Bijoy (34.94g) and Shatabdi (33.30 g) were higher in late sowing, whereas Sufi had lowest 1000 grain weight (23.81 g) and finally Bijoy produced the highest grain yield both under normal sowing late sown mediated heat stressed condition. Considering all Bijoy can said to be the best performing variety amongst all and Sufi is the worst one considering specially the yield componentsand yield.
%K Heat stress
%K reproductive development
%K dry matter partitioning
%K sowing time
%K wheat
%U http://www.iioabj2010.webs.com/Ahamed%20et%20al-IIOABJ-1(3)-2010-8-16p.pdf