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Study on Self-incompatibility of Miscanthus

Author: HuBin
Tutor: JiangJianXiong; YiZiLi
School: Hunan Agricultural University
Course: Genetics
Keywords: Miscanthus self-incompatibility pollen viability stigma receptivityfluoroscope observation compatible index
Type: Master's thesis
Year: 2012
Downloads: 69
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Miscanthus is a perennial tall grass with a C4photosynthetic pathway, mostly native to the East Asia, Southeast Asia and tropic Africa. Recently, Miscanthus is considered as one of the most potential energy crops. China is the distribution center of Miscanthus germplasms. Self-incompatibility (SI) represents the most widespread strategy developed by plants, which enables the pistil of a flower to recognize and reject self-pollen. Poaceae are generally self-incompatible. Identification of self-incompatibility is a basic step of breeding process in this study, pollination and reproduction biology of four Miscanthus species were analyzed to determine their level of self-incompatibility. The main results are as follows:(1) The initial pollen viability of Miscanthus species ranged from63.2%to69.8%, and therefore, pollen viability may not be responsible for no self-pollinated seed set. Pollen longevity of Miscanthus usually lasted for about110minutes, which can limit the fertility efficiency.(2) The stigma receptivity of Miscanthus was studied. Result showed the stigma has been able to be pollinated one day before flowering. The stigma receptivity of Miscanthus can last about7days, but the optimal pollination time is around2DPA (days post anthesis). A long stigma receptivity direction is favorable to assure pollination success.(3) The P/O value of Miscanthus is6165, indicating that the breeding system of Miscanthus belongs to oligate xenogamy. On the other way, artificial self-pollination was conducted for227wild Miscanthus germplasms. The results showed that Miscanthus displays self-incompatibility.(4) Fluoroscent microscopy confirmed the self-incompatibility reaction between pollen tubes and pistil, of Miscanthus, which is in accordance with the results in compatible index test.(5) The seeds of self-compatibility materials show very low Germination rate, which is must be an important reason for the low seedling rate.

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CLC: > Agricultural Sciences > Crop
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