TY - JOUR

T1 - Potassium, an important element to improve water use efficiency and growth parameters in quinoa (Chenopodium quinoa) under saline conditions

AU - Turcios, Ariel E.

AU - Papenbrock, Jutta

AU - Tränkner, Merle

N1 - Funding Information: We would like to thank Mrs. Anna-Maria Trappe for her very important support in taking care of the plants and carrying out measurements in the laboratory. We also thank Mrs. Kirsten Fladung and Mrs. Ulrike Kierbaum (Institute of Applied Plant Nutrition, University of G?ttingen) and Birgit Lippmann (Institute of Botany, Leibniz University Hanover) for their valuable technical support. Funding of K?+?S Minerals and Agriculture is acknowledged. Open Access funding enabled and organized by ProjektDEAL.

PY - 2021/7/24

Y1 - 2021/7/24

N2 - Due to changes in the ecosystem and misuse of resources, salinity also increases. Approximately 20% of all irrigated land is affected by salinity and this will increase over time. Therefore, it is necessary to develop more environmentally friendly agricultural techniques but also to exploit potential crops with high nutritional value and tolerance to salinity like quinoa (Chenopodium quinoa Willd.). In this context, potassium is an essential macronutrient for plant growth and development. Furthermore, one of the strategies of some salt-tolerant plants is to increase the uptake of potassium under saline conditions such that the K+/Na+ ratio is maintained for a proper osmotic regulation in cells. Therefore, a study was conducted to investigate the effect of different concentrations of potassium (0.5, 2 and 6 mM K) on quinoa under different salinities (0, 100 and 200 mM NaCl). According to the results, an adequate supply of potassium under moderate salinity conditions benefited the plant growth, with a higher potassium uptake in the presence of salt. Under saline conditions, plant transpiration decreased significantly with a high correlation with stomatal density and a greater water use efficiency. Therefore, under saline conditions, adequate doses of potassium are highly recommended in quinoa cultivation.

AB - Due to changes in the ecosystem and misuse of resources, salinity also increases. Approximately 20% of all irrigated land is affected by salinity and this will increase over time. Therefore, it is necessary to develop more environmentally friendly agricultural techniques but also to exploit potential crops with high nutritional value and tolerance to salinity like quinoa (Chenopodium quinoa Willd.). In this context, potassium is an essential macronutrient for plant growth and development. Furthermore, one of the strategies of some salt-tolerant plants is to increase the uptake of potassium under saline conditions such that the K+/Na+ ratio is maintained for a proper osmotic regulation in cells. Therefore, a study was conducted to investigate the effect of different concentrations of potassium (0.5, 2 and 6 mM K) on quinoa under different salinities (0, 100 and 200 mM NaCl). According to the results, an adequate supply of potassium under moderate salinity conditions benefited the plant growth, with a higher potassium uptake in the presence of salt. Under saline conditions, plant transpiration decreased significantly with a high correlation with stomatal density and a greater water use efficiency. Therefore, under saline conditions, adequate doses of potassium are highly recommended in quinoa cultivation.

KW - elemental analysis

KW - enzyme activity

KW - gas exchange

KW - salt stress

KW - stomatal density

KW - water use efficiency

UR - http://www.scopus.com/inward/record.url?scp=85099915953&partnerID=8YFLogxK

U2 - 10.1111/jac.12477

DO - 10.1111/jac.12477

M3 - Article

AN - SCOPUS:85099915953

VL - 207

SP - 618

EP - 630

JO - Journal of Agronomy and Crop Science

JF - Journal of Agronomy and Crop Science

SN - 0931-2250

IS - 4

ER -