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Survey for genetic resources in tropical rootcrops in relation to drought resistance

与抗旱相关的热带块根作物遗传资源调查

基本信息

批准号：
13575032
负责人：
YAMAUCHI Akira
金额：
$ 8.19万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13575032/
关键词：
Ipomoea batatas Cassava Manihot esculenta Grants Water use Water stress Water use efficiency Sweetpotato Drouoht tolerance Manihot esculenta Crantz 根

项目摘要

This research was conducted in collaboration with Philippine Root Crop Research and Training Center, Leyte State University to evaluate genotypic variation in cassava and sweetpotato in drought tolerance and to identify the traits that are closely related to the tolerance. In addition to the collection of the Center, we further collected a number of genotypes from several drought-prone areas m the Philippines.Sevearl surveys among the rootcrop growing Canners indicated that the question on decision-making strategies by farmers on sustained adoption of a variety is different from the question of preference to grow a certain variety. The former involves more than just traits preference ; and includes other considerations, such as resources, availability of planting materials, use and market, perceived or actual physical or environmental constraints, etc., which is a subject for futher study.Under water stress, dry matter is a product of water use (WU) and water use efficiency (WUE). Based. on this concept, the growth responses of 28 cassava genotypes and 18 sweelpotato genotypes to water stress were examined in a series of pot experimentsIn cassava, drought significantly reduced dry matter production. Results of a correlation analysis indicate that the genotypic variation in dry matter response to drought was better explained by that in WUE than in WU. In sweetpotato, dry matter production was also significantly reduced in droughted plants. The drought treatment significantly reduced WU, while it scarcely affected WUE. These facts clearly show that the reduction of WU but not WUE caused dry matter reduction, which is opposite to the case of cassava.The results of a series of field experiments generally support those obtained by the pot experiments, which are necessary to validated by the evaluation of Genotype x Environment Interaction in further study.

这项研究是与莱特州立大学菲律宾根际作物研究和培训中心合作进行的，目的是评估木薯和甘薯在耐旱性方面的基因变异，并确定与耐旱性密切相关的性状。除了中心的收集外，我们还进一步收集了菲律宾几个干旱多发地区的一些基因类型。在根作物种植者中的几项调查表明，农民关于持续采用某一品种的决策策略的问题不同于对某一品种的偏好问题。在水分胁迫条件下，干物质是水分利用(WU)和水分利用效率(WUE)的产物。基于。在此基础上，通过盆栽试验研究了28个木薯品种和18个甘薯品种对水分胁迫的生长响应。相关分析结果表明，WUE比WU能更好地解释干物质对干旱响应的遗传变异。在甘薯中，干旱植株的干物质产量也显著减少。干旱处理显著降低了WUE，而对WUE影响不大。这些事实清楚地表明，WU的减少而不是WUE的减少引起了干物质的减少，这与卡萨尔的情况相反。一系列田间试验的结果总体上支持盆栽试验的结果，这些结果需要在进一步研究中通过对基因x环境互作的评价来验证。