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Ethylene production by loblolly pine seedlings associated with water stress
Author(s) -
Stumpff Nancy J.,
Johnson Jon D.
Publication year - 1987
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1987.tb01962.x
Subject(s) - ethylene , loblolly pine , dry weight , horticulture , chemistry , 1 aminocyclopropane 1 carboxylic acid , zoology , water stress , botany , pinus <genus> , biology , biochemistry , catalysis
Effects of water stress on production of ethylene and its precursor, 1‐aminocyclopropane‐1‐carboxylic acid (ACC), by loblolly pine ( Pinus taeda L.) seedlings from a Texas drought‐hardy and a Virginia Coastal Plain source were investigated. Ethylene production rates in needles from the Virgnia source increased slightly with initial stress (‐1.3 MPa), declined until water potential reached ‐1.6 MPa and then increased sharply at ‐2.5 MPa. The ethylene production rates in needles from the Texas also increased slightly with initial stress, then decreased with decreasing water potential. Ethylene production by root tissue was two to three times higher than needle tissue and decreased with decreasing water potential. ACC concentrations in needles of both seed sources decreased as water potential began decreasing. Below ‐1.4 MPa, ACC levels started increasing (Texas source) or remained constant until ‐2.8 MPa (Virginia source) at which time its level increased three‐fold. Mean ACC levels in root tissue [122 nmol (g dry weight) −1 ] were slightly higher than the mean levels in the needle tissue [92 nmol (g dry weight) −1 ]; roots apparently were more efficient in converting it to ethylene since ethylene production was two to three times higher than needle tissue. The modulation of ethylene synthesis by ACC synthase and ethyleneforming enzyme appeared to be influenced by stress level, organ and seed source.