Institute of Entomology, Jiangxi Agricultural University, Nanchang, China.
College of Computer and Information Engineering, Jiangxi Agricultural University, Nanchang, China.
Bull Entomol Res. 2021 Aug;111(4):420-428. doi: 10.1017/S000748532100002X. Epub 2021 Feb 15.
A southern population (S) from Xiushui County (29°1'N, 114°4'E) and a northern population (N) from Shenyang city (41°48'N, 123°23'E) of the cabbage beetle, Colaphellus bowringi vary greatly in their life-history traits, and may serve as an excellent model with which to study the inheritance of life-history traits. In the present study, we performed intraspecific hybridization using the two populations, comparing the key life-history traits (fecundity, development time, body weight, growth rate, and sexual size dimorphism (SDD)) between the two populations (S♀ × S♂ and N♀ × N♂) and their two hybrid populations (S♀ × N♂ and N♀ × S♂ populations) at 19, 22, 25, and 28°C. Our results showed that there were significant differences in life-history traits between the two parental populations, with the S population having a significantly higher fecundity, shorter larval development time, larger body weight, higher growth rate, and greater weight loss during metamorphosis than the N population at almost all temperatures. However, these life-history traits in the two hybrid populations were intermediate between those of their parents. The life-history traits in the S × N and N × S populations more closely resembled those of the maternal S population and N population, respectively, showing maternal effects. Weight loss for both sexes was highest in the S population, followed by the S × N, N × S, and N populations at all temperatures, suggesting that larger pupae lost more weight during metamorphosis. The changes in SSD with temperature were similar between the S and the S × N populations and between the N and the N × S populations, also suggesting a maternal effect. Overall, our results showed no drastic effect of hybridization on C. bowringi, being neither negative (hybrid inferiority) nor positive (heterosis). Rather, the phenotypes of hybrids were intermediate between the phenotypes of their parents.
来自秀水县（29°1'N，114°4'E）的南方种群（S）和来自沈阳市（41°48'N，123°23'E）的北方种群（N）的甘蓝小菜蛾在生活史特征上差异很大，可作为研究生活史特征遗传的理想模型。本研究采用这两个种群进行种内杂交，比较了两个种群（S♀×S♂和 N♀×N♂）及其两个杂交种群（S♀×N♂和 N♀×S♂）在 19、22、25 和 28°C 下的关键生活史特征（繁殖力、发育时间、体重、生长率和性二型性（SDD））。结果表明，两个亲种群之间的生活史特征存在显著差异，S 种群的繁殖力显著较高，幼虫发育时间较短，体重较大，生长率较高，在几乎所有温度下的变态过程中体重损失较大。然而，这两个杂交种群的生活史特征介于它们的父母之间。S×N 和 N×S 种群的生活史特征更接近其母本 S 种群和 N 种群，表现出母性效应。在所有温度下，两性的体重损失均以 S 种群最高，其次是 S×N、N×S 和 N 种群，表明较大的蛹在变态过程中损失了更多的体重。温度变化下 SSD 的变化在 S 和 S×N 种群之间以及在 N 和 N×S 种群之间相似，也表明存在母性效应。总体而言，本研究结果表明杂交对 C. bowringi 没有剧烈的影响，既不是负面的（杂种劣势）也不是正面的（杂种优势）。相反，杂种的表型介于其父母的表型之间。
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