Contrasting adaptive responses to cope with drought stress and recovery in Cenchrus ciliaris L. and their implications for tissue lignification.

Autor: Carrizo IM; Consejo Nacional de Investigaciones Científicas y Técnicas, Godoy Cruz, Argentina.; Unidad de Estudios Agropecuarios, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto Nacional de Tecnología Agropecuaria (INTA), Córdoba, Argentina., López Colomba E; Unidad de Estudios Agropecuarios, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto Nacional de Tecnología Agropecuaria (INTA), Córdoba, Argentina.; Instituto Nacional de Tecnología Agropecuaria (INTA), Centro de Investigaciones Agropecuarias (CIAP), Instituto de Fisiología y Recursos Genéticos Vegetales (IFRGV), Córdoba, Argentina.; Facultad de Ciencias Agropecuarias, Universidad Católica de Córdoba, Córdoba, Argentina., Tommasino E; Instituto Nacional de Tecnología Agropecuaria (INTA), Centro de Investigaciones Agropecuarias (CIAP), Instituto de Fisiología y Recursos Genéticos Vegetales (IFRGV), Córdoba, Argentina., Carloni E; Instituto Nacional de Tecnología Agropecuaria (INTA), Centro de Investigaciones Agropecuarias (CIAP), Instituto de Fisiología y Recursos Genéticos Vegetales (IFRGV), Córdoba, Argentina., Bollati G; Facultad de Ciencias Agropecuarias, Universidad Católica de Córdoba, Córdoba, Argentina., Grunberg K; Consejo Nacional de Investigaciones Científicas y Técnicas, Godoy Cruz, Argentina.; Unidad de Estudios Agropecuarios, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto Nacional de Tecnología Agropecuaria (INTA), Córdoba, Argentina.; Instituto Nacional de Tecnología Agropecuaria (INTA), Centro de Investigaciones Agropecuarias (CIAP), Instituto de Fisiología y Recursos Genéticos Vegetales (IFRGV), Córdoba, Argentina.
Jazyk: angličtina
Zdroj: Physiologia plantarum [Physiol Plant] 2021 Jun; Vol. 172 (2), pp. 762-779. Date of Electronic Publication: 2020 Nov 22.
DOI: 10.1111/ppl.13274
Abstrakt: Cenchrus ciliaris L. is a widely used species for cattle feed in arid and semi-arid regions due to good forage value and known tolerance to drought conditions. Here, we provide insights to adaptive responses of two contrasting genotypes of C. ciliaris (drought-tolerant "RN51" and drought-sensitive "RN1") to face drought stress and recovery conditions and the implications for tissue lignification. Drought stress caused a reversible decrease in the leaf water relationship and damage to photosystem II, leading to an increased generation of reactive oxygen species and lipid peroxidation. Plants of RN51 exhibited a pronounced increase of antioxidant enzymatic activities. Unlike the drought-sensitive genotype, RN51 exhibited further development of lignified tissues and bulliform cells and had the greatest thickness of the adaxial epidermis. Drought stress led to the rapid activation of the expression of lignin biosynthesis pathway-related enzymes. The transcript level of the caffeoyl-CoA O-methyltransferase gene decreased in RN1, whereas cinnamoyl-CoA reductase transcripts were increased in RN51. After rewatering, the tolerant genotype recovered more rapidly than RN1. Even though the two genotypes survived when they were exposed to drought stress, RN1 showed the highest reduction in growth parameters, and this reduction was sustained during rewatering. The results indicated that the capacity to regulate lipid peroxidation and mitigate oxidative damage could be one of the mechanisms included in tolerance to drought stress. In addition, the development of foliar characteristics, like thickness of the adaxial epidermis, well-developed bulliform cells, and intensive lignified tissues, are considered anatomical adaptive strategies for drought tolerance in C. ciliaris.
(© 2020 Scandinavian Plant Physiology Society.)
Databáze: MEDLINE
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