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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Discontinuous hydration in seeds of Sarcomphalus joazeiro Mart. Hauenschild (Rhamnaceae) improve seedling tolerance to water deficit
AU - da Costa Oliveira, Maria Fernanda
AU - Ciriaco da Silva, Elizamar
AU - Alves Vieira, Evandro
AU - Resende Silva, Kleber
AU - Moreira Lobo, Ana
AU - Alves da Silva, Emerson
PY - 2024/11/30
Y1 - 2024/11/30
N2 - Water is an essential abiotic factor for seed imbibition process. Seeds of several Caatinga species have a physiological strategy known as seed hydration memory to mitigate the effects of irregular rainfall patterns in this environment. However, the mechanisms behind are not well understood. Therefore, our study aimed to evaluate the occurrence of water memory in Sarcomphalus joazeiro seeds through ecophysiological, biochemical and anatomical analyzes. The seeds were subjected to different cycles (0, 1, 2, and 3) of hydration (12 h) and dehydration (48 h)-HD, or continuous hydration (CH) for 183 h. The seedlings obtained of these seeds were subjected to different water suspension cycles. Our results showed that seeds subjected to HD cycles had greater germinability, higher emergence speed index, lower T50 values, and accumulated higher proline content. Seedlings from the 0, 1, and 2 seed HD cycles showed decreased net carbon assimilation (A) only when subjected to severe stress after 21 days of water deficit compared to the daily irrigated plants. While in seeds exposed to 3-HD cycles after 21 days of water deficit A did not change compared to control. Our results evidenced that seeds subjected to 3-HD cycles conferred the plants a greater tolerance to water deficit, proving the existence of seed hydration memory in Sarcomphalus joazeiro.
AB - Water is an essential abiotic factor for seed imbibition process. Seeds of several Caatinga species have a physiological strategy known as seed hydration memory to mitigate the effects of irregular rainfall patterns in this environment. However, the mechanisms behind are not well understood. Therefore, our study aimed to evaluate the occurrence of water memory in Sarcomphalus joazeiro seeds through ecophysiological, biochemical and anatomical analyzes. The seeds were subjected to different cycles (0, 1, 2, and 3) of hydration (12 h) and dehydration (48 h)-HD, or continuous hydration (CH) for 183 h. The seedlings obtained of these seeds were subjected to different water suspension cycles. Our results showed that seeds subjected to HD cycles had greater germinability, higher emergence speed index, lower T50 values, and accumulated higher proline content. Seedlings from the 0, 1, and 2 seed HD cycles showed decreased net carbon assimilation (A) only when subjected to severe stress after 21 days of water deficit compared to the daily irrigated plants. While in seeds exposed to 3-HD cycles after 21 days of water deficit A did not change compared to control. Our results evidenced that seeds subjected to 3-HD cycles conferred the plants a greater tolerance to water deficit, proving the existence of seed hydration memory in Sarcomphalus joazeiro.
U2 - 10.1007/s11056-024-10061-x
DO - 10.1007/s11056-024-10061-x
M3 - Journal article
VL - 55
SP - 1825
EP - 1842
JO - New Forests
JF - New Forests
SN - 0169-4286
IS - 6
ER -