肉苁蓉花序上种子粒重的空间分布研究

Cistanche deserticola were used to study the spatial distribution of seed grain weight on the C.deserticola inflorescence. The results showed that: 1) The biomass on middle and lower part of inflorescence increased 37.6% and 81.1% than upper part of inflorescence. 2) The total accumulation of non-structural carbohydrate on middle and lower part of inflorescence increased 33.5% and 58.8% than upper part of inflorescence,while the accumulation of non-structural carbohydrate in seed on middle and lower part of inflorescence increased 65.7% and 71.0% than upper part of inflorescence.3) The seed grain weight on middle and lower part of inflorescence increased 55.5% and 60.1% than upper part of inflorescence,while the contribution rate for seed yield per plant increased 13.36% and 14.46%.4) Compared with the upper part of inflorescence, the proportion of large seeds (> 0.7 mm) increased 8.0% and 11.5%, the proportion of small seeds (＜0.5 mm) reduced 3.1% and 5.6%,the 1000-grain weight increased 18.48% and 21.17%,the seed plumpness increased 6.7% and 8.9%,the seed germination rate increased 18.0% and 25.3%.These findings suggested that the difference of nutrient supply among different parts of the inflorescence caused the vertical distribution of seed grain weight on the C.deserticola inflorescence.