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Title: Changing Temperature Conditions during Somatic Embryo Maturation Result in Pinus pinaster Plants with Altered Response to Heat Stress
Authors: Sales, Ester
Cañizares, Eva
Pereira, Cátia 
Pérez-Oliver, María Amparo
Nebauer, Sergio G
Pavlović, Iva
Novák, Ondřej
Segura, Juan
Arrillaga, Isabel
Keywords: somatic embryogenesis; abiotic stress; resilience; photosynthesis; maritime pine; leaf anatomy
Issue Date: 24-Jan-2022
Project: MICINN and European Regional Development Fund Project (AGL2016-76143-C4-01-R) 
Czech Science Foundation (20-22875S) 
Ministry of Education, Youth and Sports of the Czech Republic, from the European Regional Development Fund (CZ.02.1.01/0.0/0.0/16_019/0000827) 
Serial title, monograph or event: International Journal of Molecular Sciences
Volume: 23
Issue: 3
Abstract: Under the global warming scenario, obtaining plant material with improved tolerance to abiotic stresses is a challenge for afforestation programs. In this work, maritime pine (Pinus pinaster Aiton) plants were produced from somatic embryos matured at different temperatures (18, 23, or 28 °C, named after M18, M23, and M28, respectively) and after 2 years in the greenhouse a heat stress treatment (45 °C for 3 h/day for 10 days) was applied. Temperature variation during embryo development resulted in altered phenotypes (leaf histology, proline content, photosynthetic rates, and hormone profile) before and after stress. The thickness of chlorenchyma was initially larger in M28 plants, but was significantly reduced after heat stress, while increased in M18 plants. Irrespective of their origin, when these plants were subjected to a heat treatment, relative water content (RWC) and photosynthetic carbon assimilation rates were not significantly affected, although M18 plants increased net photosynthesis rate after 10 days recovery (tR). M18 plants showed proline contents that increased dramatically (2.4-fold) when subjected to heat stress, while proline contents remained unaffected in M23 and M28 plants. Heat stress significantly increased abscisic acid (ABA) content in the needles of maritime pine plants (1.4-, 3.6- and 1.9-fold in M18, M23, and M28 plants, respectively), while indole-3-acetic acid content only increased in needles from M23 plants. After the heat treatment, the total cytokinin contents of needles decreased significantly, particularly in M18 and M28 plants, although levels of active forms (cytokinin bases) did not change in M18 plants. In conclusion, our results suggest that maturation of maritime pine somatic embryos at lower temperature resulted in plants with better performance when subjected to subsequent high temperature stress, as demonstrated by faster and higher proline increase, lower increases in ABA levels, no reduction in active cytokinin, and a better net photosynthesis rate recovery.
ISSN: 1422-0067
DOI: 10.3390/ijms23031318
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais
I&D CFE - Artigos em Revistas Internacionais

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