摘要
为探究不同播期和根伤处理对机插水稻返青期秧苗生长特性及光合色素含量的影响,以湘早籼6号和株两优819为材料,设置3个播期(早稻季T1、中稻季T2和晚稻季T3)和3个根伤(无根伤、留根2 cm、留根1 cm)处理,对返青期秧苗的株高、根长、干物质量以及叶绿素含量进行比较分析。结果表明:相较于早稻季,湘早籼6号和株两优819在中稻季和晚稻季返青期的株高、地上部和地下部的鲜、干质量显著提升。在不同播期,留根1 cm处理下湘早籼6号和株两优819的株高、主根长、地上部和地下部鲜、干质量下降,但不同根伤处理间无显著差异。播期显著影响返青期水稻的叶绿素含量,尤其是在移栽后15 d,中稻季和晚稻季秧苗的叶绿素a、叶绿素b、总叶绿素和类胡萝卜素含量较早稻季明显下降。移栽后的前期,叶绿素a、叶绿素b、总叶绿素和类胡萝卜素含量随根伤程度增加而降低,但移栽后12 d,不同根伤处理水稻的叶绿素a、叶绿素b、总叶绿素和类胡萝卜素含量差异均不显著。总体而言,相较于根伤处理,播期对机插水稻返青期秧苗生长的影响更加明显。
To investigate the effects of different sowing dates and root injury treatments on the growth characteristics and photosynthetic pigment content of machine transplanted rice seedlings during the greening period,Xiangzaoxian No.6 and Zhuliangyou 819 were used as experimental materials.Three different sowing dates(early rice season T1,middle rice season T2,and late rice season T3)and three different root injury treatments(no root injury,2 cm root injury,1 cm root injury)were set up to measure the plant height,root length,dry matter accumulation,and chlorophyll content changes of the seedlings during the greening period.The results showed that compared to the early rice season,Xiangzaoxian No.6 and Zhuliangyou 819 significantly increased plant height,fresh and dry weight in the aboveground and underground parts during the greening period of the middle and late rice seasons.At different sowing dates,the 1cm root retention treatment resulted in a decrease in plant height,main root length,fresh and dry weight of the above ground and underground parts of Xiangzaoxian No.6 and Zhuliangyou 819,but no significant differences were observed among different root injury treatments.At the same time,the sowing date significantly affected the chlorophyll content of the two varieties during the greening period,especially on the 15th day after transplantation,the chlorophyll a,chlorophyll b,total chlorophyll,and carotenoid content in the middle and late rice seasons decreased significantly earlier in the rice season.In the early stage after transplantation,the content of chlorophyll a,chlorophyll b,total chlorophyll,and carotenoids decreased with the increase of root injury degree.However,after 12 days of transplantation,there was no significant difference in chlorophyll a,chlorophyll b,total chlorophyll,and carotenoids among different root injury treatments.Overall,compared to root injury treatment,the effect of sowing time on the growth of machine inserted rice seedlings during the green period is more significant.This study lays
作者
刘鹏
杨鹰
易军辉
曾红丽
LIU Peng;YANG Ying;YI Junhui;ZENG Hongli(College of Agronomy,Hunan Agricultural University,Changsha,Hunan 410128,China;Xiangxiang Bureau of Agriculture and Rural Affairs,Xiangxiang,Hunan 411400,China;Shaoyang Seed Management Office,Shaoyang,Hunan 422099,China)
出处
《作物研究》
2024年第4期235-248,共14页
Crop Research
关键词
水稻
栽培
播种期
根伤
生长特性
光合色素
rice
cultivate
broadcasting period
root injury
growth characteristics
photosynthetic pigment content
