火炬松和湿地松幼苗蔗糖含量与生长潜势关系的研究初报

A Preliminary Study on the Relation of Sucrose Content to Superior Growth Potential in Seedlings of Loblolly and Slash Pine

火炬松(Pinux taeda L.)和湿地松(Pinus elliottii Engelm)是我国南方重要的外引用材树种,经过多年的试验研究,已选出一批较好的种源、家系和单株,并建立了种子园。当前早期鉴定和早期选择已成为必不可少的一项研究内容,近几年来越来越多的研究者指出,林木幼龄期的某些性状或生理生化指标与成熟期性状之间存在一定的相关性,认为树木生长的早期选择是可能的,尤其从生理生化方面来探索林木早期预测的研究已引起人们的高度重视。

Through analysing the sucrose, total soluble sugar and starch contents in leaves of two types of seedlings with different growing rates (fast growing and slow growing) of loblolly pine (Pinus taeda L. ) and slash pine (Pinus ellinttii Engelm),it was found that there was an obvious difference in sucrose contents between the two patterns of seedlings of loblolly and slash pine. The sucrose contents in leaves of the fast growing seedlings of loblolly and slash pine increased by 8. 6%~26.2% and 114. 1%, respectively, as compared with those of the slow growing seedlings. The sucrose contents in leaves of su- perior provenance seedlings of loblolly and of superior family seedlings of slash pine were 55. 1% ~ 93.3 % and 87. 5%~168.4 % higher than that of control provenance and family respec- tively. Results showed that there was a relationship between the sucrose contents in seedlings of loblolly and slash pine, and their growth potential.