Physiological Effects of Galls Induced byPhylloxera notabilis(Homoptera: Phylloxeridae) on Pecan Foliage
作者:
P. C. Andersen,
R. F. Mizell,
期刊:
Environmental Entomology
(OUP Available online 1987)
卷期:
Volume 16,
issue 1
页码: 264-268
ISSN:0046-225X
年代: 1987
DOI:10.1093/ee/16.1.264
出版商: Oxford University Press
关键词: Phylloxera;photosynthesis;pecan;gas exchange;leaf conductance;transpiration;Carya illinoensis
数据来源: OUP
摘要:
Effect of thePhylloxera notabilisPergande gall was assessed on leaf chlorophyll, leaf nutrient status, and leaf gas exchange of nursery pecan,Carya illinoensis(Wangenh.) C. Koch, ‘Stuart’. Gall tissue was significantly different from ungalled tissue in every nutrient investigated. Galls contained 60% N, 50% Ca, and 50% Al, but 260% K, 150% P, and 200% Na of leaf tissue from uninfested (control) leaflets. Analysis of concentric rings of tissue revealed that chlorophyll and all macronutrients except P were altered in leaf tissue 0–1.5 cm away from a gall compared with control leaflets. Net CO2assimilation rate of infested tissue was reduced by an average of 27%, which was equivalent to almost 4-fold the percentage of gall area occurring in the field of measurement. Significant reductions in leaf conductance and transpiration also occurred over leaf tissue containing a gall. Cumulative gall cross-sectional area was negatively correlated with net CO2assimilation rate. Thus, not only did theP. notabilisgall divert resources away from normal metabolic function, but it also interfered with the nutrient status and photosynthetic capacity of adjacent leaf tissue.
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