EMERGENCE, ELONGATION, AND SENESCENCE OF MAIZE SILKS
EMERGENCE, ELONGATION, AND SENESCENCE OF MAIZE SILKS
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DOI：
10.2135/cropsci1993.0011183x003300020011x
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发表时间：
1993-03-01
期刊：
影响因子：
2.3
通讯作者：
WESTGATE, ME
中科院分区：
文献类型：
--
作者：
BASSETTI, P;WESTGATE, ME
在玉米（Zea mays L.）中，在花丝从壳中出现后，花丝对花粉的接受性持续时间是有限的。这种感受性的丧失是否反映了整个穗或单个雌花的衰老尚不清楚。因此，我们研究了两个杂交品种穗发育不同的穗丝出苗、伸长和衰老之间的关系。植物在温室的土壤中生长。对于这两个杂交种，第一丝出现在从穗基部的花位置6至15。随后是从逐渐年轻的花在向顶顺序的丝。所有花的花丝在4（杂种1）至8（杂种2）天内暴露。蚕丝的伸长在暴露的第一天最为迅速，随着时间的推移逐渐下降，并在9至11天内完全停止。花丝在出壳后约7 ~ 8d开始衰老。第一批暴露的丝绸也是第一批衰老的。衰老首先表现为在丝的基部3 mm处的组织中膨胀度的损失，随后该组织完全塌陷。在杂交1中，这一过程从外周细胞向中央组织进行。在杂交体2中，蛛丝的中心组织首先崩溃。花位对吐丝至衰老的间隔时间及衰老过程无明显影响。这些结果表明，玉米的花丝经历了一个明确的模式的出现，伸长和衰老。模式是相似的花的位置上的耳朵，但是，这些发展的事件的时间和持续时间的特点是个别杂交种。
In maize (Zea mays L.), duration of silk receptivity to pollen is limited after silks emerge from the husks. Whether this loss in receptivity reflects senescence of the entire ear or individual pistillate flowers is not known. Therefore, we examined the relationships between emergence, elongation, and senescence of silks in two hybrids varying in ear development. Plants were grown in soil in the greenhouse. For both hybrids, the first silks to emerge were from Flower Positions 6 to 15 from the base of the ear. These were followed by silks from progressively younger flowers in acropetal sequence. Silks of all flowers were exposed within 4 (Hybrid 1) to 8 (Hybrid 2) days. Silk elongation was most rapid during the first day of exposure, declined progressively with time, and ceased completely within 9 to 11 d. Silks began to senesce almost-equal-to 7 to 8 d after emergence from the husk. The first silks to be exposed were also the first to senesce. Senescence was first evident as a loss of turgidity in tissues at the basal 3 mm of the silk, followed by the complete collapse of this tissue. In Hybrid 1, this process progressed from the peripheral cells towards the central tissues. In Hybrid 2, the central tissues of the silk were the first to collapse. There was no apparent effect of flower position on the interval between silk emergence and silk senescence, or on the senescence process. These results show that silks of maize undergo a well-defined pattern of emergence, elongation, and senescence. The pattern is similar across flower positions on the ear; however, the timing and duration of these developmental events are characteristic of individual hybrids.