| Characteristics of grain formation and leaf response to light and CO2 in semi\|arid region under different cultivation patterns |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2022.01.01 |
| Key Words: maize cultivation pattern grain filling photosynthetic response parameters semi\|arid region |
| Author Name | Affiliation | | XU Chen | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | ZHANG Lihua | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | ZHAO Hongxiang | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | YAN Weiping | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | LIU Xiaolong | College of Life Sciences, Resources and Environment Sciences, Yichun University, Yichun, Jiangxi 336000, China | | SUN Ning | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | LI Fei | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | TAN Guobo | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | LI Qian | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | BIAN Shaofeng | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | ZHANG Zhian | College of Agronomy, Jilin Agricultural University, Changchun, Jilin 130118, China |
|
| Hits: 1134 |
| Download times: 962 |
| Abstract: |
| In order to explore the response mechanism of maize grain formation and leaf to light and CO2 under optimized cultivation pattern in semi\|arid area, a two\|year field experiment was conducted to study the effects of different cultivation patterns on grain filling characteristics, yield formation, leaf photosynthetic response curve and related parameters of maize. The results showed that the 100-grain weight and average grain filling rate of T2 treatment were significantly higher than those of T1 and CK treatments at each growth stage after silking. The average filling rate of T2 treatment increased by 31.58%, 18.00% and 30.77%, 9.80% respectively compared with CK and T1 treatments. The grain filling rate of T2 treatment reached the maximum at 20~30 days after silking, which was significantly higher than that of T1 and CK treatments and increased by 33.91%, 10.04% and 26.28% and 14.99% in 2017 and 2018 compared with CK and T1 treatments. The yield of T2 treatment was significantly higher than that of T1 and CK treatments, and increased by 15.67% and 14.03% respectively compared with T1 treatment. The net photosynthetic rate of maize leaves of three treatments increased rapidly with the increase of light intensity 300 μmol·m-2·s-1. The net photosynthetic rate of T2 treatment was significantly higher than that of T1 and CK. The quantum efficiency of optical compensation dots (AQE) of T2 treatment was significantly higher than that of T1 and CK treatment, and decreased to the lowest value among the three growth stages (V12，R1 and R3) at filling stage (R3) with the development of growth stage. The light compensation point (LCP) and light saturation point (LSP) of T2 treatment were significantly higher than those of T1 and CK treatments, and the difference between LSP and LCP of T2 treatment was the largest, reaching 1 871.6, 1 914.4, 1 891.9, 1 909.7, 1 848.6 μmol·m-2·s-1 and 1 822.4 μmol·m-2·s-1 at three growth periods (V12, R1 and R3) in 2017 and 2018. The CO2 compensation point (CCP), CO2 saturation point (CSP), maximum net photosynthetic rate (CSPn) and carboxylation efficiency (CE) were T2>T1>CK. The CCP of T1 and T2 treatments were significantly higher than that of CK. The CSP of T2 treatment was significantly higher than that of T1 and CK, and the difference between CSP and CCP of T2 treatment was the largest, reaching 540.06, 558.87, 561.19, 539.13, 518.54 μmol·mol-1 and 574.73 μmol·mol-1 at three growth periods (V12, R1 and R3) in 2017 and 2018. The CE of T2 treatment was significantly higher than that of T1 and CK treatments at R1 and R3 stages. The maximum carboxylation efficiency (Vcmax), maximum electron transfer rate (Jmax) and triose phosphate utilization (TPU) of Rubisco of T1 and T2 treatments were significantly higher than those of CK treatment. In conclusion, the optimized cultivation pattern (T2 treatment) maintained the photosynthetic capacity of leaves, promoted the use of weak light for photosynthesis, and increased the adaptability of maize to light and CO2. Thus, T2 treatment enhanced the transport capacity of photosynthetic products and carbon fixation and carboxylation capacity of leaves, promoted grain filling, and improved the efficiency of resource utilization and maize yield. It is suitable for popularization and application in the semi\|arid area of Western Jilin Province. |
|
|
|