Effects of Population Regulation on the Source-sink System of Hybrid Wheat

doi:10.7668/hbnxb.20193203

Abstract

Abstract:

In order to clarify the effect of population regulation of hybrid wheat on source-sink system,taking two-line hybrid wheat varieties Jingmai 6 as the research object,the population source and sink characteristics of hybrid wheat were analyzed from the aspects of population structure,material accumulation and yield composition.The results showed that,in terms of source system,increasing the seeding rate could increase the dry matter accumulation in the population,but the post-anthesis dry matter accumulation and the seed rate increase did not show a synchronous growth relationship.The accumulation ratio and post-anthesis matter productivity basically showed a decreasing trend with the increase of density.There was no significant difference in the post-flowering matter accumulation between the medium and high density treatments.The proportion of post-anthesis matter accumulation and post-anthesis matter productivity basically decreased with the increase of seed rate.In terms of sink system,hybrid wheat sink capacity was not significantly affected by seed rate,and had a very significant positive correlation with yield.Under the condition of medium and low seed rate,and the ear-leaf area ratio and the grain number-leaf area ratio is relatively high.Hybrid wheat had the characteristics of large and stable sink capacity and high sink-source ratio.With the increase of seed rate,the yield of hybrid wheat showed a unimodal curve,which was higher under the seed rate of 225×10⁴-375×10⁴/ha.In order to build a reasonable source-sink system,the varieties with high sink-source ratio,strong and sustainable source function,high tillering ability and high distribution and utilization efficiency of stored dry matter,and the cultivation strategy of controlling seed rate and moderately reducing input are beneficial to the realization of the goal of "increasing the source,strengthening the source" of hybrid wheat after anthesis,also to build a balanced source-sink system,which is also of special significance for further improving the yield of hybrid wheat.

Key words: Hybrid wheat, Population regulation, Source-sink system, Sink capacity, Balance

ZHANG Shengquan, WANG Zheng, YANG Weibing, REN Liping, YE Zhijie, GAO Xinhuan, GAO Jiangang, LOU Hongyao, DU Bing, CHEN Zhaobo. Effects of Population Regulation on the Source-sink System of Hybrid Wheat[J]. Acta Agriculturae Boreali-Sinica, 2022, 37(S1): 74-80. doi: 10.7668/hbnxb.20193203.

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References 25

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处理 Treatments	群体 Total population	上三叶 Top 3 leaves
A1	3.53±0.18d	2.75±0.20b
A2	3.84±0.07c	2.71±0.16b
A3	4.06±0.13b	2.79±0.23b
A4	4.27±0.09b	3.35±0.17a
A5	4.75±0.26a	3.73±0.31a
A6	4.53±0.11a	3.31±0.22a

处理 Treatments	群体 Total population	上三叶 Top 3 leaves
A1	3.53±0.18d	2.75±0.20b
A2	3.84±0.07c	2.71±0.16b
A3	4.06±0.13b	2.79±0.23b
A4	4.27±0.09b	3.35±0.17a
A5	4.75±0.26a	3.73±0.31a
A6	4.53±0.11a	3.31±0.22a

处理 Treatments	生育期/(×10⁴/hm²) Growth stage					分蘖成穗率/% Reproductive ear percentage
处理 Treatments	冬前 Overwinter	返青 Regreening	起身 Raising	拔节 Jointing	成熟 Maturity	分蘖成穗率/% Reproductive ear percentage
A1	304.5±12.7f	301.5±13.4d	1 368.8±103.9c	862.5±55.3c	562.5±22.5b	37.7±3.6a
A2	592.5±34.6e	577.5±25.3c	1 862.5±99.8b	1 293.8±90.4b	575.0±14.7b	24.8±2.7b
A3	852.0±25.1d	798.0±25.8b	2 150.0±93.6a	1 582.5±97.3a	637.5±37.7a	21.4±2.5b
A4	1 042.5±76.4c	981.0±41.3b	2 198.8±78.5a	1 635.0±62.5a	682.8±31.0a	20.2±2.0b
A5	1 297.5±119.6b	1 231.5±51.4a	2 225.0±85.7a	1 627.5±76.1a	664.6±23.4a	15.7±2.1c
A6	1 434.0±78.5a	1 342.5±65.9a	2 000.0±104.6a	1 642.5±88.7a	645.3±27.8a	12.6±1.4c

处理 Treatments	生育期/(×10⁴/hm²) Growth stage					分蘖成穗率/% Reproductive ear percentage
处理 Treatments	冬前 Overwinter	返青 Regreening	起身 Raising	拔节 Jointing	成熟 Maturity	分蘖成穗率/% Reproductive ear percentage
A1	304.5±12.7f	301.5±13.4d	1 368.8±103.9c	862.5±55.3c	562.5±22.5b	37.7±3.6a
A2	592.5±34.6e	577.5±25.3c	1 862.5±99.8b	1 293.8±90.4b	575.0±14.7b	24.8±2.7b
A3	852.0±25.1d	798.0±25.8b	2 150.0±93.6a	1 582.5±97.3a	637.5±37.7a	21.4±2.5b
A4	1 042.5±76.4c	981.0±41.3b	2 198.8±78.5a	1 635.0±62.5a	682.8±31.0a	20.2±2.0b
A5	1 297.5±119.6b	1 231.5±51.4a	2 225.0±85.7a	1 627.5±76.1a	664.6±23.4a	15.7±2.1c
A6	1 434.0±78.5a	1 342.5±65.9a	2 000.0±104.6a	1 642.5±88.7a	645.3±27.8a	12.6±1.4c

处理 Treatments	冬前/ (kg/hm²) Overwinter	拔节/ (kg/hm²) Jointing	孕穗/ (kg/hm²) Booting	开花/ (kg/hm²) Anthesis	成熟期/ (kg/hm²) Maturity	花后物质积累量/(kg/hm²) Dry matter after anthesis	开花前物质积累比例/% Relative proportion of dry matter before anthesis	开花后物质积累比例/% Relative proportion of dry matter after anthesis
A1	552.4±23.4d	1 221.0±76.5d	3 488.0±124.5d	6 124.5±223.9c	10 831.5±477.8b	4 707.0±204.2ab	56.5±0.5c	43.5±0.6a
A2	724.5±56.9b	2 313.0±145.3c	5 008.0±223.1c	6 937.7±304.2c	11 481.8±689.1b	4 544.1±178.9b	60.4±1.1b	39.6±1.2b
A3	732.1±45.6b	3 880.5±155.8b	6 288.0±245.3b	8 374.5±563.2b	12 844.5±783.9b	4 470.0±198.4b	65.2±0.9a	34.8±0.3c
A4	679.4±51.1c	3 964.5±126.7b	6 656.0±378.5b	8 991.0±365.4b	14 154.8±798.3a	5 163.8±205.3a	63.5±1.3ab	36.5±0.8bc
A5	866.6±76.3a	4 059.0±98.2b	8 040.0±357.2a	10 281.0±643.7a	15 204.0±899.4a	4 923.0±177.4a	67.6±1.9a	32.4±0.3c
A6	695.0±45.2c	5 176.5±195.1a	8 064.0±403.6a	10 631.3±732.2a	15 795.0±766.2a	5 165.0±161.2a	67.3±2.4a	32.7±0.5c

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