The effects of insufficient and excessive mineral nutrition on the relative growth rate (RGR); the rate of total dark respiration (ΣR); gross photosynthesis (Pg); and the contents of endogenous IAA, ABA, and cytokinins (CK) were studied in 20–60-day-old seedlings of plant species that differed in their responses to these factors: beet root (Amaranthus retroflexusL.), orchard-grass (Dactylis glomerataL.), and common wheat (Triticum aestivumL.). The changes in the level of mineral nutrition lowered the RGR and Pgvalues and the IAA/ABA and CK/ABA ratios and increased the ΣRand ΣR/Pgvalues and ABA content, especially in A. retroflexusand T. aestivum. The authors propose a new way to assess the respiratory cost of adaptation to stress based on the relation between the RGR and the ΣR/Pgvalues. The adaptation component of ΣRis shown to relate to the ABA content.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 10, 2004
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