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Dissertation Research: Correlations in the Timing of Life History Stages: Their Origins and Consequences

论文研究：生命史阶段时间的相关性：它们的起源和后果

基本信息

批准号：
9623574
负责人：
D. Lawrence Venable
金额：
$ 0.49万
依托单位：
University of Arizona
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1996
资助国家：
美国
起止时间：
1996-06-15 至 1998-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9623574&HistoricalAwards=false
关键词：
Dissertation Research Correlations Timing Life

项目摘要

9623574 Venable Research funded by this award explores the evolutionary importance of variation in the timing of resource availability for desert plants. A prominent feature of desert ecosystems is extreme variability in moisture and temperature within and among years. The focus of this study is on annual plants that complete their life cycle in less than one year. The study system, Plantago insularis, is an important food source for herbivores and granivores in Sonoran and Mohave Desert communities. The annual life history promotes the avoidance of intervals of low resource availability via seed dormancy. For this strategy to be successful, the timing of seed germination and seed production must be synchronized with yearly weather patterns. Using a combination of field and greenhouse experiments, the research will test the genetic basis of variation in germination and flowering times and ascertain the fitness consequences of these characters. Findings will allow tests of theory on plant adaptations to variable environments. In addition, environmental and genetic aspects of the correlation between two developmentally linked traits, germination time and flowering time, will be resolved. One application of this knowledge is in the selection and breeding of annual crop species for earlier flowering times.

小行星9623574 该奖项资助的研究探索了沙漠植物资源可用性时间变化的进化重要性。沙漠生态系统的一个突出特点是年内和年间的湿度和温度变化极大。这项研究的重点是一年生植物，完成其生命周期在不到一年。研究系统，车前insularis，是一个重要的食物来源，食草动物和granivores在索诺兰和莫哈维沙漠社区。每年的生活史促进通过种子休眠避免资源可用性低的间隔。为了使这一战略取得成功，种子发芽和种子生产的时间必须与每年的天气模式同步。通过田间和温室试验相结合，本研究将测试发芽和开花时间变异的遗传基础，并确定这些性状的适应性后果。研究结果将允许对植物适应可变环境的理论进行测试。此外，环境和遗传方面的相关性之间的两个发展连锁性状，发芽时间和开花时间，将得到解决。这一知识的一个应用是选择和培育一年生作物品种，使其开花时间更早。