r-x1缺失诱导的玉米单体和三体及其对胚乳发育的影响

B. Lin, E. Coe
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引用次数: 20

摘要

玉米10号染色体上的r-x1缺陷导致胚囊发育过程中不分离。与r-x1相关的籽粒大小的变化被发现与胚胎中单体和三体的非整倍性相关。在70粒正常大小的籽粒中,非整倍体胚率仅为10%(4个单体,3个三体),而41粒小粒的非整倍体胚率为44%(10个单体,1个双单体,7个三体),32粒中粒的非整倍体胚率为44%(1个单体,12个三体,1个三体)。假设籽粒大小减小是由于胚囊一次有丝分裂未分离后胚乳的非整倍性造成的,观察到的小籽粒中次倍体:超倍体:整倍体胚胎的比例与第一次或第三次有丝分裂未分离的情况不一致,但与第二次有丝分裂未分离的情况很吻合。在这个分裂上的不分离导致了胚胎、细胞和细胞之间相应和不相应的结构。
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Monosomy and trisomy induced by the r-x1 deletion in maize, and associated effects on endosperm development
The r-x1 deficiency on chromosome 10 of maize conditions nondisjunction during embryo sac development. Variations in kernel size associated with r-x1 are found to be correlated with aneuploidy, both monosomy and trisomy, in the embryo. Among a sample of 70 normal-sized kernels only 10% had aneuploid embryos (4 monosomies, 3 trisomies), while 41 selected small kernels had 44% aneuploids (10 monosomies, 1 double monosomic, 7 trisomics) and 32 medium kernels also had 44% aneuploids (1 monosomic, 12 trisomics, 1 triple trisomic). On the assumption that reduced kernel size is due to aneuploidy in the endosperm following nondisjunction at one of the embryo sac mitoses, the observed proportion of hypoploid:hyperploid:euploid embryos among small kernels is inconsistent with nondisjunction at the first or third mitoses but fits well the expectation for nondisjunction occurring at the second mitosis. Nondisjunction at this division leads to both corresponding and noncorresponding constitutions between the embryo, a...
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