GENETIC VARIATION OF SOME TRAITS RELATED TO WATER DEFICIT STRESS TOLERANCE IN OATS

被引:0
作者
Elsahookie, M. M. [1 ]
Younis, N. [1 ]
Al-Khafajy, M. [1 ]
机构
[1] Univ Baghdad, Coll Agr, Dept Field Crop, Baghdad, Iraq
来源
IRAQI JOURNAL OF AGRICULTURAL SCIENCES | 2013年 / 44卷 / 05期
关键词
crop growth rate; h(b.s)(2); alpha(2)g/alpha(2)e; P.C.V%; G.C.V%;
D O I
暂无
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
To determine the degree of tolerance to water stress deficit of some oats cultivars and to identify best traits of higher genetic variance related, a field experiment was carried out through two consecutive winter seasons in 2011-2013. That was on the farm of Dept. of Field Crops, Coll. of Agric., Univ. of Baghdad. Three depths of irrigation, 5, 7 and 9 cm (main plots), and three cultivars, Hamel, Pimula and Genzania (sub-plots) were used with RCBD in a split-plot arrangement. The experiment plots were watered 5 times from planting till physiological maturity to give seasonal water of 250, 350 and 450 mm Genzania cv. gave higher grain yield (5.16 t.ha(-1)) as average of both years, 121 d to flowering and 151 d to maturity. This cultivar gave 428 racemes.m(-2) , 30 mg. kernel(-1) and higher kernels.m(-2) (17800). Crop growth rate increased with increasing water. The depth of 5 cm gave 10.6 while depth of 9 cm gave 12.0 g.m(-2).d(-1). Irrigating the crop with 7 cm gave best results in raceme.m(-2) (419), kernels.m(-2) (18500) and grain yield (5.14 t.ha(-1)). The best combination of cultivars x irrigation depth was with Genzania cv. when irrigated with 7 cm, it gave 464 racemes.m(-2) and 5.67 t.ha(-1) grain yield. Increasing depth of irrigation from 7 to 9 cm disrupted source/sink relationship, so, harvest index decreased for increased total dry matter. Pimula cv. gave higher dry matter (18 t.ha(-1)) and lower grain yield. Irrigating with 250, 350 and 450 mm gave 17.6, 15.0 and 10.5 kg/ha grains/mm of water, respectively. Days to flowering and physiological maturity were characterized by higher ratio of genetic to environmental variance, and then harvest index and total dry matter. These three traits had 87% or higher h(b.s)(2). However, these traits had similar values of P.C.V% and G.C.V%. It was concluded that these four traits could be used for selection to improve water stress tolerance for this crop, and that water consumptive use of 350 mm.season(-1) is the best, and increasing water more than that will increase vegetative growth on the account of reproductive growth.
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页码:553 / 567
页数:15
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