

FOLLOWUS
1.College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
2.Key Laboratory of Marine Genetics and Breeding of Ministry of Education, Ocean University of China, Qingdao 266003, China
MAO Yunxiang, ocean0629@korea.kr
收稿:2019-05-23,
录用:2019-7-11,
网络首发:2019-08-05,
纸质出版:2020-03
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Defensive physiological characters of
Dandan ZOU, Xianghai TANG, Liping QIU, et al. Defensive physiological characters of
Defensive physiological characters of
Dandan ZOU, Xianghai TANG, Liping QIU, et al. Defensive physiological characters of
To explore effective physiological indexes to distinguish the resistant lines and susceptible lines of
Pythium porphyrae
the causal agent of red rot disease of
Pyropia yezoensis
and establish the disease-resistance breeding strategy
we obtained and analyzed the candidate resistant and susceptible lines by population selection. Gametophytes of the candidate lines were cultured in seawater containing
Pyt. porphyrae
zoospores. Antioxidase activities
including superoxide dismutase (SOD)
peroxidase (POD) and polyphenol oxidase (PPO)
were measured and compared between the two lines before and after infection. In the resistant lines
SOD and POD activities increased and then decreased
but PPO activity rose with the prolongation of the infection time. The phenylalanine ammonia lyase (PAL) activities also increased and then decreased after infection
but it had significantly different expression in the two lines without pathogen attack. The synthesis rates of β-1
3-glucanase
and cell-wall degrading enzyme were different from each other between the two lines after infection of
Pyt. porphyrae
. Comparison in the contents of malondialdehyde (MDA) and reactive oxygen species (ROS) in the two lines showed that
the two contents varied synchronously in response to the pathogen attack. Changes of these enzymes activities or contents demonstrated that
Pyr. yezoensis
could resist against the pathogen of
Pyt. porphyrae
with the antioxidant defense capacity. In addition
β-1.3-glucanase content showed extremely significant difference between the two lines
and the PAL had consistent expression difference. Therefore
phenylalanine ammonia lyase (PAL) and β-1
3-glucanase can be considered as an effective index to distinguish susceptible line and resistant line
with which the workload of the resistant breeding could be reduced in the future.
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