Evolution and improvement of cultivated amaranths with reference to genome relationship among A. cruentus, A. powellii and A. retroflexus
Evolution and improvement of cultivated amaranths with reference to genome relationship among A. cruentus, A. powellii and A. retroflexus
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参考苋菜、鲍氏苋和反枝苋基因组关系的栽培苋菜的进化和改良
DOI：
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发表时间：
1999
影响因子：
2
通讯作者：
R. Pandey
中科院分区：
文献类型：
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作者：
R. Pandey
对3种谷物品种苋菜（Amaranthus cruentus）、粗粒苋（A. powellii）和逆转录苋（A. retroflexus）及其F1杂交种进行了减数分裂研究，以阐明栽培型和野生型的基因组关系以及物种形成的细胞遗传学机制。3个种在形态上不同，细胞学上一致，中期有17个二价体。形态上，种间杂交要么是中间的，要么是野生亲本的整体优势。减数分裂中期染色体分析我在F1的种间杂交a powellii与印度和墨西哥登记入册的cruentus显示平均染色体协会第二第三第四1.0 + 0.10 + 14.78 + 0.14我第二第三第四和1.0 + 0.45 + 14.20 + 0.25我和前的5.81%和8.44%后花粉粒生殖,分别与a和a . retroflexus cruentus(印度和墨西哥)显示几乎相似的染色体关联。这些研究表明，在所有这三个物种之间密切的基因组同源性涉及某些染色体畸变导致他们的进化。
Meiotic studies were carried out in four accessions of three grain species, viz. Amaranthus cruentus, A. powellii and A. retroflexus and their F1 hybrids to elucidate the genome relationships between the cultivated and wild types and the cytogenetical mechanisms involved in speciation. All the three species were morphologically distinct and cytologically uniform with 17 bivalents at metaphase I. Morphologically the interspecific hybrids were either intermediate or had an overall dominance of wild parents. Chromosome analysis at meiotic metaphase I in the F1 interspecific hybrids of A. powellii with the Indian and Mexican accessions of A. cruentus showed an average of chromosome association of 1.0 IV + 0.10 III + 14.78 II + 0.14 I and 1.0 IV + 0.45 III + 14.20 II + 0.25 I and 5.81% in the former and 8.44% in the later pollen grain fertility, respectively and that of A. retroflexus with A. cruentus (Indian and Mexican) showed almost similar chromosomal associations. These studies show close genomic homology amongst all these three species involving certain chromosomal aberrations resulting in their evolution.