研究了 Nicotiana knightiana X N. umbratica 种间杂种和双二倍体的形态学、细胞学和不育性。

A study of morphology, cytology and sterility in interspecific hybrids and amphidiploids of Nicotiana knightiana X N. umbratica.

机构信息

Department of Botany, Andhra University, Visakhapatnam, India.

出版信息

Theor Appl Genet. 1985 Jun;70(3):330-2. doi: 10.1007/BF00304921.

Abstract

Interspecific hybrids and amphidiploids of Nicotiana knightiana Goodspeed (n= 12)x N. umbratica Burbidge (n = 23) resembled either parent in some characters and were intermediate in other characters. The F1 hybrids (2n = 35) showed mostly univalents during meiosis, while the amphidiploids (2n = 70) formed bivalents almost regularly. The former were completely sterile and the latter fully male fertile but predominantly female sterile. This female sterility was due to disintegration of the embryo sacs leading to collapsed ovules. The few fertile ovules, however, showed normal development of embryo sac and embryo. The occurrence of fertile and sterile ovules was believed to be due to segregation of the genes governing sterility.

摘要

Nicotiana knightiana Goodspeed（n=12）x N. umbratica Burbidge（n=23）种间杂种和双二倍体在某些特征上类似于亲本，而在其他特征上则处于中间状态。F1 杂种（2n=35）在减数分裂过程中主要表现为单价体，而双二倍体（2n=70）则几乎规则地形成二价体。前者完全不育，后者完全雄性可育，但主要是雌性不育。这种雌性不育是由于胚囊解体导致胚珠塌陷。然而，少数可育胚珠表现出胚囊和胚的正常发育。可育和不育胚珠的出现被认为是由于控制不育的基因的分离。