Grain Yield Performance of Interspecific Irrigated Rice Genotypes in the Senegal River Valley, as Affected by the Cropping Seasons.

Twelve interspecific Genotypes, derived from the cross between three O.sativa varieties (IR 64, IR 1529-680-3-2 AND IR 31851-96-2-3-2-1) as recurrent parents and TOG 5681 (o. glaberrima)as donor parent, were evaluated for their yield performance. In the wet season period of 2004 and dry season period of2005, fields trials were conducted at Ndiaye (16o 14’N, 16o14’W) and Fanaye (16.33’N, 15o46’W) in the Senegal River Valley to evaluate new interspecific genotypes for intensified double cropping of irrigated rice. The experiment design was a split –split –plot with two replications. The seed quantity from the same source was enough for two replications, two sites and two seasons. Outstanding interspecific genotypes yielding 7-8 t ha were identified. WAS 122-IDSA-10-WAS-10-WAB-2-WAS-1 was the highest yielding variety at the two sites (8117 kg ha). WAS191-4-WAB-1-WAS-1 yielded more than 8 t ha at Fanaye in each season. Most of the interspecific genotypes matured earlier than the sativa checks. These findings have potential practical value for the double cropping systems in Senegal River Valley and Delta.

以3个亚洲栽培稻（O. sativa）品种（IR 64、IR 1529-680-3-2 及 IR 31851-96-2-3-2-1）作为轮回亲本，以TOG 5681（非洲栽培稻O. glaberrima）作为供体亲本杂交获得的12个种间基因型，开展了产量表现评价。2004年湿季与2005年旱季，研究团队在塞内加尔河谷的Ndiaye（16°14′N，16°14′W）与Fanaye（16.33°N，15°46′W）两个试验点开展田间试验，以评估新种间基因型在集约化双季灌溉稻种植体系中的应用潜力。本试验采用裂裂区试验设计，设置2次重复，同一来源的种子量可满足2次重复、2个试验点以及2个季别的试验需求。最终筛选出产量达7~8吨/公顷的优异种间基因型：其中WAS 122-IDSA-10-WAS-10-WAB-2-WAS-1在两个试验点均为最高产品系，单产达8117千克/公顷；WAS191-4-WAB-1-WAS-1在Fanaye试验点的两个季别中均实现了超8吨/公顷的产量。多数供试种间基因型的生育期早于亚洲栽培稻对照品种。本研究结果可为塞内加尔河谷及三角洲地区的双季种植体系提供潜在的实用应用价值。