Premium
Effects of uniconazole or gibberellic acid application on the lignin metabolism in relation to lodging resistance of culm in common buckwheat ( Fagopyrum esculentum M.)
Author(s) -
Fang X.,
Liu X.,
Zhang Y.,
Huang K.,
Zhang Y.,
Li Y.,
Nie J.,
She H.,
Ruan R.,
Yuan X.,
Yi Z.
Publication year - 2018
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/jac.12274
Subject(s) - cinnamyl alcohol dehydrogenase , lignin , cultivar , phenylalanine ammonia lyase , peroxidase , gibberellic acid , fagopyrum , ethephon , horticulture , biology , chemistry , botany , enzyme , biochemistry , biosynthesis , ethylene , catalysis , germination
Lignin plays an important role in increasing the mechanical intensity of culm and improving lodging resistance of culm. In this study, three common buckwheat, Youqiao2 (lodging‐tolerant cultivar; YQ 2), Ningqiao1 (middle lodging‐tolerant cultivar; NQ 1) and Ukraine daliqiao (lodging‐susceptible cultivar; UD ), were used to investigate the effects of spraying exogenous hormones uniconazole (S‐3307) or gibberellic acid ( GA 3) on lignin metabolism and its relation to lodging resistance in the three common buckwheat cultivars. Results showed that application of S‐3307 significantly increased lignin content and its related enzymes activities of phenylalanine ammonia‐lyase ( PAL ), 4‐hydroxy cinnamoyl CoA ligase (4 CL ), cinnamyl alcohol dehydrogenase ( CAD ) and peroxidase ( POD ). The major genes involved in lignin synthesis, PAL , CCR ( cinnamyl CoA reductase ), C4H ( cinnamate4‐hydroxylase ), 4 CL and CC o AOMT ( caffeoyl CoA O‐methyltransferase ), were all upregulated expression, and COMT ( catechol‐O‐methyltransferase ) was downregulated. What is more, application of S‐3307 significantly improved the resistance of common buckwheat stem to lodging and increased yield. Whereas, spraying with GA 3 caused opposite effect on those characteristics. These results suggested that application of exogenous S‐3307 or GA 3 significantly changed the risk of lodging occurred by regulating the lignin metabolism in culms of common buckwheat.