荒漠植物准噶尔无叶豆结实、结籽格局及其生态适应意义  

Patterns of fruit and seed production and ecological significance in desert species Eremosparton songoricum(FABACEAE)

作　　者：施翔[1,2] 王建成[1] 张道远[1,3] 刘会良[1] 

机构地区：[1]中国科学院干旱区生物地理与生物资源重点实验室,中国科学院新疆生态与地理研究所,乌鲁木齐830011 [2]石河子大学农学院林学系,石河子832011 [3]中国科学院吐鲁番沙漠植物园,新疆838008

出　　处：《生态学报》2011年第17期4935-4940,共6页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(30970543;31070472);国家重点基础研究发展计划(2009CB825104);中国科学院“十二五”预研重要方向性项目群项目(kSCX2-YW-Z-1020)

摘　　要：连续2 a采用野外记录的方式对荒漠植物准噶尔无叶豆的结实、结籽格局进行了比较研究。结果表明:植株内花序生成格局表现为不同大小的花序在总花序中的比重与其结实率存在显著正相关,其中含有中等花数目的花序所占的比重及其结实率均最高,此种分布格局能够最大程度的保证繁殖成功;果序内果实生成格局表现为单花着生位置(从近柄端算起)与其结实量占总结实量的比例成线性负相关,花序基部的结实比例最高,顶部结实比例近为0;荚果内种子生成格局表现为:中间位置的胚珠败育率最低。另外,年际间荚果内仅有(1.08±0.03)粒和(1.07±0.03)粒种子能够完全成熟,此种结籽格局是准噶尔无叶豆保证后代质量的最佳策略。Plant reproductive modules include flowers,inflorescences,fruits and seeds,and also the reproductive branches that bear these plant parts,which have certain distribution pattern and quantitative change dynamics.Selective abortion is one of the sources of seed plant fruiting and seeding patterns.In order to determine the patterns of fruit production among and within inflorescences,seed production within pods,and further examine the evolutionary,ecological significance of selective abortion in a desert species Eremosparton songoricum（Litv.） Vass.,we did our research over two years in a wild population in the north edge of Gurbantunggut Desert,XinJiang,China.To record the fruit production among inflorescences,141 and 105 inflorescences from twenty individual plants were randomly chosen in 2007 and 2008,respectively.Fruit development and position within each inflorescence were monitored daily,and the number of completely mature fruits within each inflorescence was counted to get the frequency distribution and the fruit set of different inflorescence sizes.To determine percentage of fruit production from basal position to distal position within the inflorescences,100 inflorescences with 16 and 13 flowers were chosen in 2007 and 2008,respectively.To determine the seed production within pods,300 completely mature fruits were randomly chosen in 2007 and 2008 to monitor the seed production from basal position to distal position within each pod.Results showed that the frequency distribution and fruit set of different inflorescence sizes were positively correlated,with the middle inflorescence size being the most frequent and also having the highest fruit set,which appears to be the optimal reproductive strategy;The flowers from the basal position of an inflorescence were more likely to set fruit,which appears to maintain the reproductive success from the adaptive strategy angle,and the percentage of fruit production at the distal position of an inflorescence was approximately zero which may be make up to the loss of ba

关 键 词：准噶尔无叶豆 结实格局 结籽格局 繁殖成功 

分 类 号：Q948[生物学—植物学]