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Osmolyte accumulation in leaves and Na + exclusion by roots in two salt–treated forage grasses
Author(s) -
AlvarezPizarro Juan Carlos,
Sousa Kleyton Chagas,
Silva Johny de Souza,
Silva Antonia Almeida,
GomesFilho Enéas
Publication year - 2020
Publication title -
grassland science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 19
eISSN - 1744-697X
pISSN - 1744-6961
DOI - 10.1111/grs.12274
Subject(s) - salinity , forage , chemistry , osmolyte , proline , agronomy , biology , botany , zoology , horticulture , ecology , biochemistry , amino acid
Abstract The responses of Urochloa brizantha and Megathyrsus maximus young seedlings to salt stress with NaCl at 0 (control), 25, 50 and 100 mmol/L under hydroponic conditions were studied. The relative growth rate of U. brizantha leaves was reduced at 50 and 100 mmol/L NaCl, whereas that of M. maximus leaves was not affected. Moreover, high oxidative damages, low chlorophyll content and severe reduction of osmotic potential were observed in U. brizantha leaves when subjected to 100 mmol/L NaCl. This grass also showed high accumulation of proline and soluble sugars in leaves and roots. M. maximus efficiently regulated leaf K + concentration and restricted Na + transport by retention in roots. The leaf K + /Na + ratio was higher in M. maximus than in U. brizantha at 50 and 100 mmol/L NaCl. Overall, both grasses displayed different mechanisms to reduce the deleterious effects of salinity, but the control of ion homeostasis exhibited by M. maximus contributed notably to improved performance of this grass when grown under saline conditions.