Journal
PLANTS-BASEL
Volume 10, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/plants10040769
Keywords
Pinus massoniana; drought; coexpression; hormone; peroxisome
Categories
Funding
- Science and Technology Talent Platform Project of Guizhou Province [[2018] 5261, 32060353]
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Masson pine is an important coniferous tree species that responds to drought stress by regulating hormone pathways and antioxidant mechanisms. Both roots and needles of Masson pine may utilize the same antioxidant mechanism to cope with drought stress.
Pinus massoniana Lamb. is an important coniferous tree species in ecological environment construction and sustainable forestry development. The function of gene gradual change and coexpression modules of needle and root parts of P. massoniana under continuous drought stress is unclear. The physiological and transcriptional expression profiles of P. massoniana seedlings from 1a half-sibling progeny during drought stress were measured and analyzed. As a result, under continuous drought conditions, needle peroxidase (POD) activity and proline content continued to increase. The malondialdehyde (MDA) content in roots continuously increased, and the root activity continuously decreased. The needles of P. massoniana seedlings may respond to drought mainly through regulating abscisic acid (ABA) and jasmonic acid (JA) hormone-related pathways. Roots may provide plant growth through fatty acid beta-oxidative decomposition, and peroxisomes may contribute to the production of ROS, resulting in the upregulation of the antioxidant defense system. P. massoniana roots and needles may implement the same antioxidant mechanism through the glutathione metabolic pathway. This study provides basic data for identifying the drought response mechanisms of the needles and roots of P. massoniana.
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