cje ›› 2012, Vol. 31 ›› Issue (09): 2217-2224.
• Articles • Previous Articles Next Articles
GAO Ze-rui1, ZHANG Chang-qin2**, HAN Zhi-qiang1, LI Zhong1, WEI Jie1, SHI Hong-lin1
Online:
Published:
Abstract: By the methods of field observation and artificial pollination, this paper studied the characteristics of pollination biology and breeding system of endangered species Craigia yunnanensis in the fragmented habitats of Fadou distribution area, Xichou County of Yunnan Province, Southwest China. Each cyme of the C. yunnanensis had 2-9 hermaphroditic flowers, and the lifespan of a single hermaphroditic flower was approximately 3-4 days. There existed certain temporal isolation (dichogamy) and spatial isolation (herkogamy) between the pistils and stamens of each hermaphroditic flower. The outcrossing index (OCI) was >4, and the ratio of pollen to ovule (P/O) was 1381±53. The most frequent and effective pollinator was Chrysomyia megacephala. The fruiting rate of geitonogamous pollination was rather low, and thus, the breeding system of C. yunnanensis was mainly belonged to outcrossing, with partial selfcompatibility, and the pollinator insects were essential. Both the fruit-setting ratio and the seed-bearing ratio under natural conditions were low as 56.67%±3.85% and 6.26%±0.75%, respectively, whereas artificial xenogamous pollination could significantly promote the fruit-setting and seed-bearing ratios (P< 0.01). In the fragmented habitats, the pollinators were lesser, and the pollination efficiency was lower, suggesting that habitat fragmentation affected the early stage reproduction process of C. yunnanensis plants.
Key words: forestry remote sensing, spectral mixture analysis, sequential Gaussian co-simulation, forest carbon density, Hunan Province.
GAO Ze-rui1, ZHANG Chang-qin2**, HAN Zhi-qiang1, LI Zhong1, WEI Jie1, SHI Hong-lin1. Pollination biology and breeding system of Craigia yunnanensis in fragmented habitat.[J]. cje, 2012, 31(09): 2217-2224.
0 / / Recommend
Add to citation manager EndNote|Ris|BibTeX
URL: https://www.cje.net.cn/EN/abstract/abstract20297.shtml
https://www.cje.net.cn/EN/Y2012/V31/I09/2217