摘要
本文就光周变化对马尾松毛虫生长发育的效应作了进一步观察。在28℃时,于不同光周处理条件下,马尾松毛虫的幼虫历期、虫龄和死亡状况均明显不同。当幼虫前期为长光周(L:D=15:9)时,15—Ⅰ和15—Ⅱ两组的幼虫平均历期分别为30.8d和33.4d,其主要结茧龄期分别为5龄和6龄;当幼虫前期为短光周时(L:D=12:12),12—Ⅰ和12—Ⅱ两组幼虫的平均历期分别为64.5d和145.0d,其主要结茧龄期分别是7龄和8龄;当幼虫后期为长光周时(15—Ⅰ,12—Ⅱ),其幼虫历期明显较短;短光周时(15—Ⅱ,12—Ⅰ),其幼虫历期明显较长,若整个幼虫期均为短光周时,幼虫可长到10龄,其历期最长可达5个月。
The duration and age of Dendrblimus punctatus Walker vary greatly with the photoperiods experienced by the larvae during larval period. The larvae treated with longday cycles (L:D = 15:9) in the earlier in-stars can develop into pupae in the 5th and 6th instar and their average larval duration is about one month, and there is no obvious variation between the durations no matter what photoperiods the larvae experienced in the later instars. But, the larvae exposed under shortday cycles (L:D= 12: 12) in the earlier instars can produce one or two more instars and their duration can exceed two months. The photoperiods in the later instars also exert important effect on the larval duration and age, longday cycles can curtail larval duration and shortday cycles can procrastinate larval period. However, the impact of short photoperiods in the later instars on larval duration and age depends on the photoperiods undergone by the larvae in the earlier instars. With the characteristic of oligopause, some of the larvae treated with the life-long short photoperiods can even pupate in the 10th instar and experience five-month larval period.
出处
《林业科学研究》
CSCD
北大核心
1993年第3期276-281,共6页
Forest Research
基金
国家自然科学基金
关键词
马尾松毛虫
光照周期反应
生长
Dendrolimus punctatus, photoperiod, growth and development