IONS ACCUMULATION, PROLINE CONTENT AND JUICE QUALITY OF SUGAR BEET GENOTYPES AS AFFECTED BY WATER SALINITY

Authors: A. H. Mari, I. Rajpar, Zia-ul-Hassan, S. Tunio, S. Ahmad
Journal: Journal of Animal and Plant Sciences (JAPS)
ISSN: 1018-7081 (Print), 2309-8694 (Online)
Volume: 28  Issue: 5  Pages: 1405-1412
Year: 2018
DOI: NA
URL: https://doi.org/NA
Publisher: Pakistan Agricultural Scientists Forum

Abstract:
In arid and semiarid regions salinity affects physiology of most of the plants. Under salt stressed conditions, plants do not uptake required quantity of nutrient elements from soil solution; they rather uptake and accumulate larger quantity of + - + + toxic ions like Na , Cl , etc. Plants have various mechanisms to tolerate soil salinity. Among these mechanisms, K /Na discrimination and synthesis of osmo-protectants is recognized as most effective ways to cope with salt-stress environment. However, variation exists among these genotypes. The goal of this study was to stress ten sugar beet (Beta -1 vulgare L.) genotypes with 4, 8, 12 and 16 EC (dS m ) levels of saline water in field plots up to maturity and determine + + - variations in Na , K and Cl concentrations in the sap of fully mature leaves, proline (osmo-protectant) content of leaf tissues and juice quality. The genotypes included in the study were: California, Ernestina, Magnolia, Mirabella, Sandrina, SD 12970, SDPAK 03/06, SDPAK01/07, SDPAK 07/07 and SDPAK 09/07. The results indicated that the -1 + - plants grown on soil receiving saline water of EC 4, 8, 12, and 16 (dS m ) salt solutions accumulated more Na and Cl + + + and less K . Hence they displayed lower K /Na ratio in their leaves. Under salt-stress environment of soil receiving -1 saline water of EC 8 and 16 (dS m ), sugar beet plants have synthesized more proline in their leaves. Among the 10 genotypes included in the study, four ( California, SD PAK 09/07, SD PAK 03/06 and SD PAK 01/07) were found with + + + + less Na , more K and lower K /Na ratio, these genotypes were also able to exhibit more proline in leaves, under salt- stress environment, possibly to counter the osmotic effect of salts. + + + + cumulative or individual in nature such as osmotic, ionic,

Keywords: Sugar beet, genotypes, proline, Na , K , K /Na .