Abiotic stress on seed germination and plant growth of Zeyheria tuberculosa  

作　　者：Robson Luis Silva de Medeiros Rinaldo Cesar de Paula Joao Vitor Oliveira de Souza Joao Pedro Peixoto Fernandes 

机构地区：[1]Department of Agricultural Sciences,School of Agricultural and Veterinarian Sciences,Sao Paulo State University(Unesp),14884-900,Jaboticabal,Sao Paulo,Brazil

出　　处：《Journal of Forestry Research》2023年第5期1511-1522,共12页林业研究（英文版）

基　　金：supported by the National Council for Scientific and Technological and Development (CNPq) (Process number141302/2018-6)。

摘　　要：Zeyheria tuberculosa(Vell.)Bureau ex Verl.is among the Brazilian flora threatened with extinction.It has high-quality wood and can be used to recover herbicidecontaminated areas.However,abiotic stresses can harm seed germination and seedling development under adverse conditions and need to be understood to improve autochthonous or indigenous biodiversity conservation and strengthen reforestation projects.This study evaluated the effects of temperature,water and saline stress on Z.tuberculosa seed germination and water stress on seedling growth.Three laboratory experiments evaluated germination under:(1)different temperatures(20,25,30,35 and 40℃);(2)different water potentials simulated with polyethylene glycol(PEG6000)at 25 and 30℃;and,(3)different osmotic potentials simulated with NaCl at 25 and 30℃.In addition,a greenhouse experiment subjected seedlings to five water regimes(20%,35%,50%,65%and 80%of maximum substrate water holding capacity).In the laboratory,seedling biometry and germination were evaluated,while physiological and morphological parameters were assessed in the greenhouse.Physiological potential of seeds increased at 25 and 30℃.Germination and vigor decreased as water and saline stresses increased.Germination tolerance thresholds for water and salt stresses were-0.6 and-0.4 MPa,respectively.In the greenhouse,the most restrictive water regimes reduced seedling physiological and morphological parameters.Seedling development was compromised at moisture levels below50%field capacity.

关 键 词：BIGNONIACEAE Climate change Ipê-felpudo Ipê-preto Water stress 

分 类 号：S792[农业科学—林木遗传育种]