Roots Characteristics Among Different Rice Varieties And Their Effects On Plant Methane Transport Rate

Paddy field is an important source of greenhouse gas methane,which plays an important role in global anthropogenic emissions of methane and has an important impact on the global greenhouse effect.Therefore,it is important to study the difference of methane emission from different rice varieties and clarify the relationship with the methane release potential,which is of great significance to the high yield of rice and greenhouse gas emission reduction.In this paper,20 early rice varieties and 20 late rice varieties were used to carry out the hydroponic experiment.The relationship between the root characteristics and the methane transport capacity of different types of early rice varieties and late rice varieties was studied in order to provide the basis for the formation mechanism of methane emission in different rice varieties.Research indicates:(1)The rice transport capacity of different rice varieties was significantly different.The methane transport rates of Changliangyou 35 were 0.117 m mol/m~2/s,which were significantly lower than those of Luliangyou 171,Jiefengyou 1,Zhuyouyou 19,Jinyou 268and Zhuyouyou 819,the difference of methane transport rate between early rice and the highest methane transport rate was about 82.5%.The methane transport rate of Zhongzao 39was 0.103 m mol/m~2/s in conventional early rice,and the lowest methane transport rate in conventional early rice was the highest,the difference in the rate of varieties is about 90.8%.The methane transport rate of Fengyuanyou 299 was 0.054 m mol/m~2/s,and the difference between the lowest methane transport rate and the highest methane transport rate was about91.4%.The average methane transport rate among the four cultivars was not different significantly.The average methane transport rate in hybrid rice was lower than that in conventional early rice,and the difference was 5%.The average methane transport rate in hybrid rice was less than that in conventional early rice,the difference was 74.0%.There was no significant difference in the methane transport rate between hybrid rice and conventional rice under the hydroponics test conditions.(2)There was a significant positive correlation between root iron content,root specific surface area and root active absorption area,and had significant positive correlation with rice oxidative stress,and significant correlation with rice methane transport capacity negative correlation between the root index is the root weight,the longest root length.(P<0.01).The correlation coefficient between the methane transport rate and the specific surface area of the root was 0.486(P<0.01).The correlation coefficient with the root weight was-0.405(P<0.01).The correlation coefficient between the methane transport rate and the active absorption area was 0.320,and the correlation coefficient with the longest root length was-0.280(P<0.05).The correlation coefficient between the methane transport rate and the root iron content of the late rice was 0.496(P<0.01).The correlation coefficient with the specific surface area of the root was 0.342(P<0.01).The correlation coefficient between methane transport rate and active absorption area was-0.420,which was significantly correlated(P<0.01).The correlation coefficient with plant height was-0.398(P<0.01).(3)The results showed that the low-methane transmission rate of early rice was:Tanyuanyou 4903,Zhuyouyou 17,Luliangyou 996,Jinyou 212,Zhuliangyou 819 and Zhuliangyou 189,Zhongjiazao 17,Zhongzao 39,Xiangzaoxian 6.The yield of low methane in late hybrid rice was Zhunliangyou 608,Shenyou 9586,Fengliangyou 296,Jiyou 299,Fengyuanyou 299.Conventional late rice low methane rate transmission varieties are Xiangwanxian 13,Yuzhenxiang,Huanghuazhan.