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首页> 外文期刊>Journal of Experimental Botany >Sporophytic control of pollen tube growth and guidance in maize.
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Sporophytic control of pollen tube growth and guidance in maize.

机译：玉米花粉管生长的孢子控制和指导。

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Pollen tube germination, growth, and guidance (progamic phase) culminating in sperm discharge is a multi-stage process including complex interactions between the male gametophyte as well as sporophytic tissues and the female gametophyte (embryo sac), respectively. Inter- and intra-specific crossing barriers in maize and Tripsacum have been studied and a precise description of progamic pollen tube development in maize is reported here. It was found that pollen germination and initial tube growth are rather unspecific, but an early, first crossing barrier was detected before arrival at the transmitting tract. Pollination of maize silks with Tripsacum pollen and incompatible pollination of Ga1s/Ga1s-maize silks with ga1-maize pollen revealed another two incompatibility barriers, namely transmitting tract mistargeting and insufficient growth support. Attraction and growth support by the transmitting tract seem to play key roles for progamic pollen tube growth. After leaving transmitting tracts, pollen tubes have to navigate across the ovule in the ovular cavity. Pollination of an embryo sac-less maize RNAi-line allowed the role of the female gametophyte for pollen tube guidance to be determined in maize. It was found that female gametophyte controlled guidance is restricted to a small region around the micropyle, approximately 50-100 om in diameter. This area is comparable to the area of influence of previously described ZmEA1-based short-range female gametophyte signalling. In conclusion, the progamic phase is almost completely under sporophytic control in maize.
机译：花粉管萌发，生长和引导（程序化阶段）最终达到精子排出是一个多阶段过程，包括雄配子体以及孢子体组织和雌配子体（胚囊）之间的复杂相互作用。已经研究了玉米和Tripsacum中种间和种内的穿越障碍，并在此报道了玉米花粉管发育的精确描述。发现花粉萌发和最初的管生长不是很明确，但是在到达传播道之前发现了早期的第一个穿越障碍。 Tripsacum花粉对玉米丝的授粉和ga1 / Ga1s玉米丝与ga1玉米花粉的不相容授粉揭示了另外两个不相容的障碍，即传递方向错误和生长支持不足。传播途径的吸引力和生长支持似乎在程序性花粉管生长中起关键作用。离开传输道后，花粉管必须穿过卵子腔中的胚珠。玉米无胚囊RNAi系的授粉可以确定雌配子体在花粉管中的作用。发现雌配子体控制的引导被限制在微粒的周围一个小区域，直径大约为50-100 om。该区域可与先前描述的基于ZmEA1的近程雌性配子体信号传导的影响区域相比。总之，玉米的前阶段几乎完全处于孢子体控制之下。

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