Yield stability of photoperiod sensitive sorghum (Sorghum bicolor L. Moench) accessions under diverse climatic environments.
Yield stability of photoperiod sensitive sorghum (Sorghum bicolor L. Moench) accessions under diverse climatic environments.
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DOI：
10.3923/ijar.2012.17.32
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发表时间：
2012-01-01
期刊：
影响因子：
--
通讯作者：
Brueck, H.
中科院分区：
文献类型：
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作者：
Abdulai, A. L.;Parzies, H.;Brueck, H.
气候变率是热带地区的一个特征，夏季季风从5月/6月开始，大部分在10月结束，从而产生了不可预测的可变长度2011年12月9日生长季节。这给热带干旱和半干旱地区的主要替代品小保持器持有者带来了严重挑战。进行了一项研究，以确定可达到的粮食产量和产量稳定性的10个良好的特点和广泛种植的热带高粱种质在18个环境，包括3个播种日期在3个地点（沿着纬度梯度覆盖3个农业生态区）在马里超过2年。对于每一年和地点组合，高粱加入和播种日期安排在一个裂区，并在一个随机完全区组（RCB）设计进行测试。采用适当的栽培措施和时机，以尽量减少生物因素的影响。除了谷物产量外，还确定了与延迟播种相关的产量损失。采用2个静态指标和5个动态指标评价了不同环境下不同基因型的籽粒产量稳定性。平均籽粒产量范围从0到248克m-2的环境，从74到208克m-2的10个基因型，一般推迟播种减少。结合光周期敏感性和持绿性状的基因型被揭示为最稳定的。在基因型的排序方面，所使用的稳定性指标之间观察到的相似性和差异。这些适应气候变化的影响进行了讨论。
Climate variability is a characteristic feature of the tropics where the summer monsoon starts from May/June and ends mostly in October, thus producing an unpredictably variable length December 9, 2011 of growing season. This results in serious challenges for the mainly substituent small holder farmers in the arid to semi-arid zones of the tropics. A study was conducted to determine the attainable grain yield and yield stability of 10 well characterized and extensively cultivated tropical sorghum accessions across 18 environments comprised of 3 dates of sowing at 3 sites (along a latitudinal gradient covering 3 agro-ecological zones) over 2 years in Mali. For each year and site combination, sorghum accessions and dates of sowing were arranged in a split plot and tested in a Randomized Complete Block (RCB) design. Appropriate cultural practices and timing were used to minimize effects of biotic factors. In addition to Grain yield, yield penalty associated with delayed sowing was determined. Two static and five dynamic indices were used to assess the stability of grain yield for genotypes across environments. Mean grain yield ranged from 0 to 248 g m-2 across environments, from 74 to 208 g m-2 across the 10 genotypes and generally reduced with delayed sowing. A genotype combining photoperiod sensitivity and stay-green traits was revealed as the most stable. The similarities and differences were observed among the stability indices used in terms of ranking of the genotypes. Implications of these for adaptation to climate change are discussed.