TY - JOUR

T1 - Photosynthetic activity as assessed via chlorophyll a fluorescence suggests a role of potassium channels in root to shoot signaling.

AU - Войцеховская, Ольга Владимировна

AU - Apollonov, V.I.

AU - Murtuzova, A.V.

AU - Черныш, Мария Александровна

AU - Дроздова, Ирина Валерьевна

AU - Беляева, Алла Игоревна

AU - Ковалева, Ольга Николаевна

AU - Лоскутов, Игорь Градиславович

AU - Демидчик, Вадим Викторович

AU - Тютерева, Елена Владимировна

PY - 2020

Y1 - 2020

N2 - Potassium is indispensable for plant growth. Recently, a role of K+ channels has emerged in sensing and transducing stress and nutrient status. Tetraethylammonium (TEA+) is a specific blocker of K+ transport and affects K+ channel gene expression. Two barley varieties with contrasting salinity tolerance, and a chlorophyll b-less mutant, were grown either in the presence of TEA+ alone or combined with NaCl, at two different concentrations of external K+ and Ca2+, and were analyzed nine days after germination. Chlorophyll a transients monitored via JIP-tests were used to evaluate the state of the photosynthetic machinery. In contrast to reported responses to K+ deficiency, TEA+ inhibited shoot growth while inducing root growth and increasing photosynthetic performance. Both TEA+ and NaCl induced the appearance of negative K-bands in OJIP kinetics and an increase in PIABS, indicating a stimulation of photosynthesis by increased sink strength in the context of root to shoot signaling.

AB - Potassium is indispensable for plant growth. Recently, a role of K+ channels has emerged in sensing and transducing stress and nutrient status. Tetraethylammonium (TEA+) is a specific blocker of K+ transport and affects K+ channel gene expression. Two barley varieties with contrasting salinity tolerance, and a chlorophyll b-less mutant, were grown either in the presence of TEA+ alone or combined with NaCl, at two different concentrations of external K+ and Ca2+, and were analyzed nine days after germination. Chlorophyll a transients monitored via JIP-tests were used to evaluate the state of the photosynthetic machinery. In contrast to reported responses to K+ deficiency, TEA+ inhibited shoot growth while inducing root growth and increasing photosynthetic performance. Both TEA+ and NaCl induced the appearance of negative K-bands in OJIP kinetics and an increase in PIABS, indicating a stimulation of photosynthesis by increased sink strength in the context of root to shoot signaling.

KW - chlorina f2

KW - ion content

KW - quaternary ammonium salts

KW - salt stress

KW - chlorina f2

KW - ion content

KW - quaternary ammonium salts

KW - salt stress

M3 - Article

VL - 58

SP - 608

EP - 621

JO - Photosynthetica

JF - Photosynthetica

SN - 0300-3604

IS - 2

ER -