Data/hora: 06/06/2024 02:38:11

Provedor de dados: | 42
País: | Brazil
Título: | ABA regulation of post-germination desiccation tolerance in wheat cultivars contrasting in drought tolerance
Autores: | KOUR,SATINDER; ZHAWAR,VIKRAMJIT K.
Data: | 2018-04-01
Ano: | 2018
Palavras-chave: | Abiotic; Abscisic acid; Nitric oxide; Post germination desiccation tolerance; Wheat.
Resumo: | ABSTRACT Post-germination desiccation tolerance (DT) was studied in two wheat cultivars. Effect of pretreatment of abscisic acid (ABA)/ osmotic/ salt/ heat stress was also studied. One day (d)-old seedlings of wheat cultivars PBW 644 (drought tolerant) and PBW 343 (drought susceptible) were exposed to ABA/stress treatment for next 1 d, desiccated for 4 d and subsequently rehydrated for 4 d. Biomass, protein, water, protein carbonyls (oxidative toxicity) and nitric oxide (NO) levels were measured in 2 d (treated), 6 d (desiccated), 10 d (rehydrated) seedlings. Vegetative reactive oxygen species (ROS)/ NO-pathways were studied under normal condition and ABA supply by supplying ROS/NO scavengers. Desiccation caused water loss and increased oxidative toxicity. PBW 644 showed very low level of toxicity but higher loss of water under desiccation. ABA/ stress pretreatment further reduced water level under desiccation and reduced biomass upon rehydration in PBW 644 only. On the other hand, PBW 343 did not show higher decrease of water but showed high toxicity under desiccation where ABA/stress pretreatment improved this response by increasing biomass upon rehydration. This indicated that PBW 644 used metabolic arrest under desiccation for survival while PBW 343 used growth promotive mode. ABA/ROS/NO-pathways were operational in both cultivars.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401493
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/0001-3765201820170632
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.90 n.2 2018
Fonte: | info:eu-repo/semantics/openAccess