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您的检索式：作者名="David C.Haak"
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| 1 | Exploring transposable element-based markers to identify allelic variations underlying agronomic traits in rice显示文摘Transposable elements(TEs)are a major force in the production of new alleles during domestication;nevertheless,their use in association studies has been limited because of their complexity.We have developed a TE genotyping pipeline(TEmarker)and applied it to whole-genome genome-wide association study(GWAS)data from 176 Oryza sativa subsp.japonica accessions to identify genetic elements associated with specific agronomic traits.TE markers recovered a large proportion(69%)of single-nucleotide polymorphism(SNP)-based GWAS peaks,and these TE peaks retained ca.25%of the SNPs.The use of TEs in GWASs may reduce false positives associated with linkage disequilibrium(LD)among SNP markers.A genome scan revealed positive selection on TEs associated with agronomic traits.We found several cases of insertion and deletion variants that potentially resulted from the direct action of TEs,including an allele of LOC_Os11g08410 associated with plant height and panicle length traits.Together,these findings reveal the utility of TE markers for connecting genotype to phenotype and suggest a potential role for TEs in influencing phenotypic variations in rice that impact agronomic traits. | Haidong Yan David C.Haak Song Li Linkai Huang Aureliano Bombarely | 2022 | Plant Communications2022，3，3： | 0 |
| 2 | 入侵植物根茎的生长和竞争力因相邻植物的不同而不同显示文摘物种内的遗传和表型变异对进化过程的影响已众所周知,但人们对种内变异如何影响群落水平过程还知之甚少。在人类对自然系统造成影响的大背景下,由于人类活动可能会产生巨大的选择压力,因此具有生态意义的种内变异可能会特别重要。在一项温室实验中,我们研究了一种分布广泛的入侵物种和农业杂草石茅(Sorghum halepense)在受到种间竞争、种内竞争和土壤肥力的影响时,其在生物量和根茎方面发生的种内变异和生态型变异。与我们的预期和此前的研究结果不同的是,我们并没有在这一早期生命阶段中发现石茅各生态型生物量的改变。然而,我们确实发现石茅的生物量会随着竞争植株种类和土壤施肥方式的不同而发生很显著的变化,同时不同株之间也存在很大差异。农业生态型的根茎较其它生态型大了11%,经施肥处理后的增大幅度更高至3倍;虽然施肥后的根茎生物量增加了~50%,但生态型之间却并无差异。有趣的是,当受到种内竞争时,与玉米(Zea mays)发生种间竞争时的情况相比,石茅的生物量和根茎生物量产出分别减少了32%和20%。我们的研究结果表明,针对相邻植株的种类而发生的物种特异性竞争响应以及根茎分配的改变,石茅在受竞争时可能会产生适应性响应,从而使分配情况发生改变。 | Alyssa Laney Smith Daniel Z.Atwater Wonjae Kim David C.Haak Jacob N.Barney | 2021 | Journal of Plant Ecology2021，14，4： | 0 |
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