PT Journal
AU Zhao, D
   Oosterhuis, D
   Bednarz, C
TI Influence of Potassium Deficiency on Photosynthesis, Chlorophyll Content, and Chloroplast Ultrastructure of Cotton Plants
SO Photosynthetica
PY 2001
BP 103
EP 109
VL 39
IS 1
DI 10.1023/A:1012404204910
WP https://ps.ueb.cas.cz/artkey/phs-200101-0022.php
DE Gossypium hirsutum; intercellular CO2 concentration; net photosynthetic rate; non-structural saccharides; photosynthate translocation; stomata conductance; transpiration rate
SN 03003604
AB In cotton (Gossypium hirsutum L.) grown in controlled-environment growth chamber the effects of K deficiency during floral bud development on leaf photosynthesis, contents of chlorophyll (Chl) and nonstructural saccharides, leaf anatomy, chloroplast ultrastructure, and plant dry matter accumulation were studied. After cotton plants received 35-d K-free nutrient solution at the early square stage, net photosynthetic rate (P<sub>N</sub>) of the uppermost fully expanded main-stem leaves was only 23 % of the control plants receiving a full K supply. Decreased leaf P<sub>N</sub> of K-deficient cotton was mainly associated with dramatically low Chl content, poor chloroplast ultrastructure, and restricted saccharide translocation, rather than limited stomata conductance in K-deficient leaves. Accumulation of sucrose in leaves of K-deficient plants might be associated with reduced entry of sucrose into the transport pool or decreased phloem loading. K deficiency during squaring also dramatically reduced leaf area and dry matter accumulation, and affected assimilate partitioning among plant tissues.
ER