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辣椒叶片物理性状对烟粉虱寄主选择的影响

何菁1,周福才1,2*,陈学好2,苏宏华2,杨爱民2,衡森2#br#   

  1. 1扬州大学生物科学与技术学院, 江苏扬州 225009; 2扬州大学园艺与植物保护学院, 江苏扬州 225009)
  • 出版日期:2016-11-10 发布日期:2016-11-10

Effects of physical characteristics of pepper leaves on host selection of Bemisia tabaci.

HE Jing1, ZHOU Fu-cai1,2*, CHEN Xue-hao2, SU Hong-Hua2, YANG Ai-min2, HENG Sen2#br#   

  1. (1College of Biological Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; 2College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, Jiangsu, China).
  • Online:2016-11-10 Published:2016-11-10

摘要: 以10个不同抗性水平的辣椒品种为材料,通过笼内释放烟粉虱的方法,研究了不同辣椒品种对烟粉虱寄主选择的影响,同时通过对辣椒叶片茸毛密度、维管束埋深、叶片蜡质含量、叶片颜色等4个主要物理性状的分析,探讨了辣椒叶片物理性状对烟粉虱的抗选择性机制。结果表明:烟粉虱对不同品种辣椒的选择性存在明显的差异,不同品种辣椒叶片茸毛密度、维管束埋深、蜡质含量以及叶片颜色也存在明显的差异;烟粉虱在不同品种辣椒上落虫量与物理性状的相关性分析发现,叶片茸毛密度与烟粉虱成虫量存在显著正相关,维管束埋深和叶片颜色与烟粉虱成虫量存在显著负相关,而蜡质含量与烟粉虱成虫量没有显著的相关性;释放24 h后,叶片茸毛密度、维管束埋深和叶片颜色与烟粉虱虫量的回归方程分别为:Y=0.632x+13.493(r=0.953,P=0.000)、Y=-587.572x+449.035(r=0.660,P=0.038)、Y=-209.815x+259.088(r=0.642,P=0.046);成虫量(Y)与叶片茸毛密度(X1)、维管束埋深(X2)、叶片颜色(X4)的多元逐步回归方程为:Y=0.583X1+26.999X2-56.126X4+56.953,通径系数分别为P茸毛密度Y=-0.879、P维管束埋深Y=0.030、P叶片颜色Y=-0.172;释放72 h时叶片颜色与烟粉虱成虫量没有明显的相关性。表明在烟粉虱寄主选择的前期,叶片颜色起最主要的作用,72 h时后叶片茸毛密度起最主要的作用;产卵选择与取食选择趋势基本一致。

关键词: LHCⅡ磷酸化, 状态转换, 光系统, 非光化学猝灭

Abstract: Effect of ten pepper varieties with different resistances on host selection was studied by releasing whiteflies (Bemisia tabaci) to the cage. In addition, physical traits of pepper leaves (trichome density, vascular bundle depth, wax content and leaf color) were investigated to explore the antiselection mechanism of pepper leaves to whiteflies. The results showed that the host preference of whiteflies was significantly different for the ten varieties and there were significant differences in leaf trichome density, vascular bundle depth, wax content and leaf color among the ten varieties. The population index of whiteflies was positively correlated with leaf trichome density, but negatively correlated with leaf vascular bundle depth and leaf color. There was no significant correlation between wax content and the population index of whiteflies. After 24hour release, the regression equations between population index (Y) and leaf trichome density, leaf vascular bundle depth, or leaf color were as follows: Y=0.632x+13.493 (r=0.953, P=0.000) for leaf trichome density, Y=-587.572x+449.035 (r=0.660, P=0.038) for leaf vascular bundle depth, and Y=-209.815x+259.088 (r=0.642, P=0.046) for leaf color. The multi-step regression equation of population index (Y) and trichome density (X1), vascular bundle depth (X2), leaf color (X4) was as follows Y=0.583X1+26.999X2-56.126X4+56.953, the respective path coefficients of the equation were PX1→ Y=-0.879, PX2Y=0.030, PX4Y=-0.172. After 72hour release, there was no obvious correlation between leaf color and population index. These results indicated that at the early stage of host selection by whiteflies, leaf color played the major role; 72 hours later, however, leaf trichome density played the major role. Moreover, whiteflies had a similar trend of  host selection between spawning and feeding.

Key words: state transition, NPQ., photosystem, LHCⅡ phosphorylation