Fuel for the road – sugar transport and pollen tube growth
نویسنده
چکیده
Pollen, the male gametophyte (haploid generation) of flowering plants, is responsible for delivering sperm cells to the egg sac, a process essential for sexual reproduction. Interaction between pollen and stigma (pollination) initiates secretion in the stigma and pollen germination. The pollen tube emerges and grows through the style to the ovaries where it delivers the sperm cells to the ovule to accomplish fertilization (Box 1) (Edlund et al., 2004). In Arabidopsis, the male gametophyte consists of three cells – one vegetative cell that encloses two sperm cells. Despite this seemingly simple system, about half of all Arabidopsis genes are expressed in pollen (Bock et al., 2006). There has been much recent progress in the field of pollen biology, especially in the area of pollen tube guidance and reception by the female gametophyte (reviewed by Kanaoka and Higashiyama, 2015). Pollen tubes have been studied intensively as a model system for tip growth, a process vital in diverse cell types from fungal hyphae to cancer cells (Sanati and Geitmann, 2013). Basic research on pollen biology also has many direct practical applications. The vast majority of the world’s harvest depends upon successful plant reproduction. In many crop plants the male gametophyte is sensitive to environmental stress, such as heat and drought, which can lead to serious crop losses (Zinn et al., 2010). Understanding pollen function is therefore also of important practical interest.
منابع مشابه
Self-incompatibility in the Iranian Almond Cultivar ‘Mamaei’ Using Pollen Tube Growth, Fruit Set and PCR Technique
Self-incompatibility has been studied by using controlled pollination, pollen tube growth and PCR methods in the Iranian almond ‘Mamaei.’. Pollen tube growth and fruit set following self and cross-pollination treatments were evaluated. The percentage of initial and final fruit set was determined for each treatment at 30 and 60 days after controlled pollination. Pollen germination and pollen ...
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