Effects Of Plant Growth Regulators On Dormancy,Growth And Yield Of Amorphophallus Postgraduate Of Agriculture

Amorphophallus konjac K.Koch is a monocotyledon perennial herb in the genus Amorphophallus Blume.Plant growth regulators regulate and control different stages in the process of plant growth and development,such as germination,rooting,flowering,fruiting,leaf fall,dormancy and cell elongation,organ differentiation,flower bud differentiation,etc.This paper mainly explores the effects of plant growth regulators on konjac from two aspects.1.Through different concentrations of exogenous hormones:gibberellin(GA₃,GA₇,GA₄₊₇),auxin（IAA）,cytokinin（6-KT）soaked in the seeds of Amorphophallus bulbifer and Amorphophallus albus,the germination rate of each treatment group and the growth status of konjac seeds after sowing were observed.To explore the optimal concentration of different types of exogenous hormones to relieve dormancy and promote growth of konjac seeds.2.Through the treatment of different kinds of growth regulator products,the influence of plant growth regulators on the growth and yield of konjac was explored,and growth regulators that could effectively increase the yield of konjac were found.The main findings are as follows:1.The dormancy of Amorphophallus bulbifer seeds belongs to physiological dormancy.2.In a certain concentration range,20mg·L-1 GA3 treatment had the best effect on the germination and growth of Konjac sprouting.Compared with CK,the germination rate of Konjac was increased by 106.82%at 7d.During the growth period,the growth index and total chlorophyll content of multiple seedlings showed different degrees of improvement compared with CK.Net photosynthetic rate,post-harvest plot yield and expansion coefficient were significantly increased compared with CK.In a certain concentration range,50mg·L-1 GA3 treatment had the best effect on the germination and growth of white konjac.The final germination rate of white konjac was 51.49%,which was 21.96%higher than CK.The longest growth period of white konjac was 145d.The growth indexes of multiple seedlings were improved in different degrees compared with CK.Leaf area,chlorophyll content,net photosynthetic rate,plot yield and expansion coefficient were significantly higher than CK.3.In a certain concentration range,20mg·L-1 GA7 treatment has the best effect on the germination and growth of Konjac sprouting.The germination rate of Konjac sprouted by 20mg·L-1 GA7 treatment increased rapidly,and the germination rate reached 73.33%at 9d.The growth period of Konjac was 185d,which was 12d longer than CK.The growth indexes of multiple seedlings showed different promotion effects compared with CK.Compared with CK,the leaf area,total chlorophyll content,net photosynthetic rate,plot yield and expansion coefficient were significantly increased.In a certain concentration range,20mg·L-1 GA7 treatment had the best effect on the germination and growth of white konjac.The seed germination rate of white konjac at 14d was 37.64%,50.56%higher than that of CK.The growth period was151d,36d longer than CK.The growth indexes of multiple seedlings were improved in different degrees compared with CK,and the leaf area,chlorophyll content,net photosynthetic rate,plot yield and expansion coefficient were significantly improved compared with CK.4.Within a certain concentration range,GA4+7 treatment of 20mg·L-1 had the best effect on the germination of Konjac sprouting,while GA4+7 treatment of50mg·L-1 had the best effect on the growth of Konjac sprouting.The germination rate of Konjac seed after 20mg·L-1GA4+7 treatment was significantly higher than that of CK.After 50mg·L-1 GA4+7 treatment,the leaf disk diameter,petiole base stem,leaf area and total chlorophyll of Konjac were slightly higher than those of CK.The net photosynthetic rate,plot yield and expansion coefficient were significantly higher than CK.In a certain concentration range,20mg·L-1 GA4+7 treatment had the best effect on the germination and growth of white konjac.The germination rate of white Konjac was 48.33%at 28d,which was 14.47%higher than CK.The growth stage was 145d.The growth indexes of multiple seedlings were higher than those of CK.Leaf area,total chlorophyll content,net photosynthetic rate,plot yield and expansion coefficient were significantly higher than CK.5.Within a certain concentration range,100mg·L-1 IAA treatment had the best effect on the germination of Konjac sprouting,and 150mg·L-1 IAA treatment had the best effect on the growth of fruit-bearing Konjac sprouting.The germination rate of100mg·L-1 was significantly higher than that of CK after 3d treatment with IAA,and increased by 51.64%compared with CK.The growth indexes of 150mg·L-1 treated with IAA were slightly higher than CK.Chlorophyll content,net photosynthetic rate,plot yield and expansion coefficient were significantly higher than CK.In a certain concentration range,200mg·L-1 IAA treatment had the best effect on the germination and growth of white konjac.The germination rate of white konjac at28d was 56.67%,34.23%higher than CK.The growth stage was 139d.Compared with CK,the growth indexes and net photosynthetic rate of multiple seedlings were improved in different degrees,and the leaf area,total chlorophyll content,plot yield and expansion coefficient were significantly higher than CK.6.Within a certain concentration range,the 6-KT treatment of 150mg·L-1 had the best effect on the germination of Konjac sprouting,and the 6-KT treatment of100mg·L-1 had the best effect on the growth of fruit-bearing Konjac sprouting.150mg·L-1 6-KT treatment showed the best germination performance,and the 3d germination rate increased 97.14%compared with CK.After 100mg·L-1 6-KT treatment,the growth indexes of Konjac multiple shoots were improved to different degrees compared with CK.Leaf area,total chlorophyll content,net photosynthetic rate,plot yield and expansion coefficient were significantly higher than CK.In a certain concentration range,the 6-KT treatment of 100mg·L-1 had the best effect on the germination and growth of white konjac.The germination rate of white konjac seeds increased first and then decreased with the increase of 6-KT concentration,and the germination rate of 100mg·L-1 6-KT treatment was the highest（59.61%）.The growth stage was 139d.Compared with CK,the leaf disk diameter,petiole base stem and total chlorophyll content were increased in different degrees.Leaf area,net photosynthetic rate,plot yield and expansion coefficient were significantly higher than CK.7.500 times Maggin（20.8%alkenodo·methylpionium）microemulsion,2000times Kimmerium（30%polyodo·methylpionium）,1000 times Kimmerium（30%polyodo·methylpionium）,200mg/L acetamine,500 magic Diwang（60%choline chloride water agent）treatment significantly promoted the growth of Amorphophallus bulbifer.The yield was 4.65kg,5.10kg,8.10kg,5.80kg and 5.75kg,respectively,which increased by 24.00%,36.00%,116.00%,54.67%and 53.33%compared with the control,respectively（significant difference,P<0.05）.