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| Fruit-Set Patterns of Leymus racemosus |
| Gulnar Ablat, Zhou Guiling, Ayturhan Rayim |
| Xinjiang Key Laboratory of Grassland Resource and Ecology/College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China |
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Abstract The fruit-set patterns of the different populations, different part of an ear and spikelets of desert plants Leymus racemosus was studied for two years. The results showed that: (1) the proportion of the panicle length, spike width, total flowers numbers, seed setting rate and large seeds of L. racemosus in all five populations in 2011 were higher than that in 2012; but the numbers of small seeds were higher in 2012 than in 2011; Seed setting rates in the 5 populations were P2 >P3 >P1 >P5 >P4. (2) The sequence of The panicle length, spike width, numbers of total flowers and seed setting rate of spikelets on different part of ear were showed middle part >lower part >upper part. (3) The flowers and seeds on per spikelet were 3.7±0.56 and 0.6±0.09, respectively. And the seed setting rate on the base part of spikelet reached the highest level. By combining 2 years observation of climatic factors and different populations' environmental conditions in the period of duration, and found that the seed setting rate of L. racemosus is very sensitive to the inter-annual and environmental changes. That moisture and temperature are the main factors that influence the fruit-set patterns of L. racemosus. The resources allocation in the different part of an ear and spikelets match with the resources competition hypothesis. The characters as more flowers and less fruit of L. racemosus is a kind of reproductive assurance that adapt to the arid and rainless, and leanness desert resources environment.
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Received: 16 March 2013
Published: 20 July 2014
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Corresponding Authors:
周桂玲（Email：xjzhougl@aliyun.com）
E-mail: xjzhougl@aliyun.com
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2014, Vol. 34 
