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Effects of phosphate supply on wheat seedlings infected with powdery mildew: carbohydrate metabolism of first leaves
Author(s) -
ZULU J. N.,
FARRAR J. F.,
WHITBREAD R.
Publication year - 1991
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1991.tb00995.x
Subject(s) - powdery mildew , fructan , mildew , biology , apoplast , starch , botany , carbohydrate , horticulture , food science , sucrose , biochemistry , cell wall
summary Wheat ( Triticum aestivum L. cv. Longbow) was grown hydroponically with either 0, 0.33 or 3.3 mol Pi m −3 and, after 12 d, was infected with powdery mildew ( Erysiphe graminis D.C. ex Merat f.sp. tritici ). Fructan content of infected first leaves was increased by mildew infection but infection increased starch content only at 0 Pi. Photosynthetic 14 CO 2 fixation was reduced by infection, especially at 0 Pi. Accumulation of 14 C in fructan rose with reduced Pi supply but was unaffected by mildew; accumulation of 14 C in starch was lower in infected leaves. Pi deficiency increased the content of sugars in the apoplast, as did mildew infection, the greatest content being in infected leaves of low Pi status. Acid invertase activity was increased by infection but was not affected by Pi status. Thus P‐deficiency alone does not mimic the effects of mildew but Pi status and mildew interact in their effect on leaf carbohydrate metabolism.