In order to improve the yield of pear, pear pollen quality is the key!

What are the factors that influence the quality of pear pollen? Fruit pollen Service Center for everyone to sum up the following, we want to help!

1, pear pollen
Pear normal pollen is oval, irregular shape, small, inaperturate or aperture too much pollen were abortive pollen. Pollen abortion belongs to the type of male sterility, uninucleate pollen development is the result of suspension, dysfunction of tapetum layer. Uninucleate pollen grains appear obvious vacuolization and pollen abortion of pollen fertility is an important reason for the complete disintegration of pear poor pollination; pollen sterility is rare, the uniformity of pollen, or pollen containing insufficient pollen wall part is folded furrow deformation, distortion of pollen were irregular, for the control of gene genetic traits, commonly found in pear hybridization and inbred lines; other polyploid varieties such as pear, pear for male sterility.
2, pistil
Well developed pistil, conducive to pollination and fertilization; dysplasia of the pistil, such as narrow column is bad, not even the pollination and fertilization fertilization. The ability of pollen to accept pollen in different periods was different, and the pollen ability was strong in the first 3 days after flowering. The highest pollination and fertilization ability was found on the same day and the second day after flowering. Pear has the fertilization ability of time is generally 3 days, is the best time of artificial pollination.
3, self incompatibility
Pear is a kind of typical gametophytic self incompatibility. Whether it is self or cross pollinated flowers, a life of the pollen was germinated on the stigma in and through the stigma. In the pollen tube along the style to the ovary during the growth of pollen tube, cross pollination affinity normal growth, the majority can pass through the style to the embryo growth direction; self pollination (including cross pollination incompatible combinations) the growth of pollen tube in the style, performance, abnormal shape, pollen tube apex inflated to stop the growth of these in style, stop the growth of the pollen tube reached the embryo sac and not ultimately unable to complete fertilization.
4, climate factors
The temperature is high, the pollen germination and the pollen tube grow rapidly, and the fertilization time is short. The suitable temperature of pollen flower bud is 24 DEG C, and the temperature drops to the temperature of 5 DEG C to stop the elongation in the style. During the rainy season, it is easy to cause the pollen grains to absorb water and swell, and the drought and strong wind often cause the stigma drying, which is not good for pollen germination.
5, other factors
Sucrose and boron can promote pollen germination and pollen tube elongation, sucrose and boric acid in artificial pollination liquid (or borax), for flowering boron spray can significantly increase the fruit setting rate; in addition, LSSS and Bordeaux can lead to death, but also burns the pollen stigma, flower period should not use.

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