Lodging is an important constraint

Lodging is an important constraint limiting wheat yields and quality by bending or breaking stems on
wheat (Triticum aestivum L.) production worldwide. This study was conducted to determine whether
lignin accumulation and lodging resistance of winter wheat could be affected by application of paclobutrazol
(PP333) or gibberellin acid (GA3) at stem elongation stage (DC 3.0). Two winter wheat cultivars,
Jimai22 (lodging-tolerant cultivar; JM22) and Shannong16 (lodging-susceptible cultivar; SN16), were
used to investigate the effect of exogenous hormones on wheat lodging behavior, lignin accumulation
in culms and its relation to lodging resistance. Results showed that application of PP333 significantly
reduced plant height and the length of basal second internode, while GA3 had the opposite effect. Lignin
accumulation was positively and significantly correlated with the breaking strength of internode and
culm lodging resistance index (CLRI). PP333 significantly increased lignin accumulation and its related
enzymes activities in the basal second internode, and also increased the diameter, wall thickness, filling
degree of the internode, thus the breaking strength and lodging resistance of wheat increased. Whereas,
GA3 caused opposite effect on those characteristics. These results suggested that the exogenous PP333 or
GA3 application significantly changed the risk of lodging occurred not only by altering the plant height
but also by altering the physical strength of the basal part of the culm internode, especially, altering the
lignin accumulation and its related enzymes activities in basal internode.
© 2013 Elsevier

ผลลัพธ์ (ไทย) 1:

Lodging is an important constraint limiting wheat yields and quality by bending or breaking stems onwheat (Triticum aestivum L.) production worldwide. This study was conducted to determine whetherlignin accumulation and lodging resistance of winter wheat could be affected by application of paclobutrazol(PP333) or gibberellin acid (GA3) at stem elongation stage (DC 3.0). Two winter wheat cultivars,Jimai22 (lodging-tolerant cultivar; JM22) and Shannong16 (lodging-susceptible cultivar; SN16), wereused to investigate the effect of exogenous hormones on wheat lodging behavior, lignin accumulationin culms and its relation to lodging resistance. Results showed that application of PP333 significantlyreduced plant height and the length of basal second internode, while GA3 had the opposite effect. Ligninaccumulation was positively and significantly correlated with the breaking strength of internode andculm lodging resistance index (CLRI). PP333 significantly increased lignin accumulation and its relatedenzymes activities in the basal second internode, and also increased the diameter, wall thickness, fillingdegree of the internode, thus the breaking strength and lodging resistance of wheat increased. Whereas,GA3 caused opposite effect on those characteristics. These results suggested that the exogenous PP333 orGA3 application significantly changed the risk of lodging occurred not only by altering the plant heightแต่ยัง โดยการดัดแปลงความแข็งแรงทางกายภาพของส่วนแรกเริ่มของ internode การ โดยเฉพาะ ดัดแปลงการลิกนิสะสมและกิจกรรมของเอนไซม์ที่เกี่ยวข้องใน internode แรกเริ่ม© 2013 Elsevier