花粉

SRK gene and SP 11/SCR gene are thought to be two key molecules in SI The protein of SP 11/SCR encoding specifically expressed in the anther tapetum and in pollen.

SRK基因是雌蕊柱头中自交不亲和反应的专一决定因子，编码SP11/SCR基因的蛋白在花药壁和花粉中特异表达。

Besides, the area in which the female tassel could be pollinated w...

在大田生产中，雄穗保留1/15～1/25是满足花粉要求的理论比例。

The outer pollen wall ultrastructure of 4 excellent germplasms and their cutting offsprings showed that the tectum,columellac,foot layer and endexine had no notable variation.

花粉外壁超微结构所显示的覆盖层、柱状层、基层和外壁内层的形状或厚度，4份优质资源与其扦插后代均无明显变化。

From tetrad stage to microspore stage, the ABA content in sterile buds was higher than fertile buds.

四分体到小孢子单核期和小孢子二核后期至成熟花粉期不育花蕾ABA含量仍高于可育花蕾。

In conclusion, abnormal meiosis of PM-Cs is the cytogenetic causes for fertility reduction of tetraploid melon.

花粉母细胞减数分裂的异常是同源四倍体甜瓜育性低的细胞学原因。

The result showed that the plant of Maicao No. 9 was tall, with good fecundity, fully filled grain and vigorous growth. The chromosome number of the root cells was 2n=56, through the observation of pollen mother cells meiosis, there were a certain amount of univalents, ring bivalents and bar bivalents in PMCM. Different numbers of lagging chromosomes, chromosome bridges and micronucleus were found in anaphaseⅠ, anaphaseⅡ and tetraspore.

结果表明：麦草9号植株高大，结实性较好，籽粒饱满，生长旺盛；根尖细胞染色体数目为2n=56，对其进行花粉母细胞减数分裂观察，中期Ⅰ具有一定数量的单价体、环状二价体、棒状二价体；后期Ⅰ、后期Ⅱ与四分体时期都出现不同数量的落后染色体、染色体桥、微核等现象。

A study on the pollen morphology of Thalictrum L.

Title 唐松草属花粉形态的研究。

In this paper, three methods were used to detemined the pollen viability of maize , including iodine-iodide kalium method, triphenyl tetrazolium chloridemethod and germination in vitro.

本文采用碘-碘化钾法，氯化三苯基四氮唑法及离体萌发法对花粉活力进行了室内测定，并与大田测定结果做了相关分析。

Progeny of this plant included aneuploids, such as trisomic and tetrasomic.

这一异常植株的花粉母细胞仍为混倍体，其子代中有二倍体和各种非整倍体植株。

N l male gamete transmission of trisomic 2,7,9 had the relation with chromosome behavior at meiosis and with the degression of pollen activity.Besides,n l male gamete fertilization ability and 2n l embryo development ability perhaps could influnce it,too.

6.2号、7号、9号三体n 1雄配子传递率与减数分裂过程中染色体的行为和花粉生活力的降低有关，同时，n 1雄配子受精能力、2n 1胚发育能力可能也会影响n＋l雄配子的传递率。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。