THE DIVERSITY OF INTERSPECIFIC POLLEN-PISTIL INCONGRUITY IN NICOTIANA

被引:4
作者
KUBOYAMA, T [1 ]
CHUNG, CS [1 ]
TAKEDA, G [1 ]
机构
[1] SANGJI UNIV,FAC AGR,WONJU 220702,SOUTH KOREA
来源
SEXUAL PLANT REPRODUCTION | 1994年 / 7卷 / 04期
关键词
REPRODUCTIVE BARRIER; INTERSPECIFIC HYBRIDIZATION; NICOTIANA; UNILATERAL INCONGRUITY; POLLEN TUBE;
D O I
暂无
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Nicotiana tabacum was used as a pistillate parent and crossed with three self-compatible species, N. rustica, N. repanda and N. trigonophylla, which were previously reported to have pollen tubes unilaterally inhibited by N. tabacum pistil. Temporal and morphological observations revealed distinct differences of pollen tube behavior among these incongruous crosses. Pollen tubes of N. repanda were arrested in stigma and those of N. rustica in the middle of the style. On the other hand, pollen tubes of N. trigonophylla continued growing at a slow rate. Tubes of N. repanda and N. rustica showed morphological abnormalities such as swelling, thick wall, and irregular callose deposition. In addition, tubes of N. rustica often elongated in reverse direction and wound about in the middle of the style. Although the tubes of N. trigonophylla were apparently normal in morphology, they were distributed throughout the transmitting tissue, differing from the self-pollination of N. tabacum in which they were confined to the peripheral region of it. The diversity of pollen tube behavior indicates that physiological causes of incongruity are different among the three crosses. Bud pollination enabled pollen tubes to reach the ovary in all crosses, indicating that the N. tabacum pistil acquired its ability to inhibit foreign pollen tube elongation with its development. When interspecific hybrids between N. tabacum and the other three species were pollinated by parental species, tubes reached the ovary in all crosses, but the elongation rate of tubes slowed down and morphology was abnormal.
引用
收藏
页码:250 / 258
页数:9
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