Crops ›› 2025, Vol. 41 ›› Issue (5): 195-203.doi: 10.16035/j.issn.1001-7283.2025.05.026

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Photosynthesis-Grain Filling Coordination Characteristics of Winter Wheat with Different Plant Types and Their Impact on Yield Components

Li Jiahui1(), Chen Ruxue2(), Bai Hongbo3, Wang Yonghua2()   

  1. 1 Jiaozuo Municipal Bureau of Agriculture and Rural Affairs, Jiaozuo 454100, Henan, China
    2 College of Agronomy, Henan Agricultural University / National Engineering Research Center for Wheat, Zhengzhou 450046, Henan, China
    3 Henan Maixiangfeng Agricultural Science and Technology Co., Ltd., Mengzhou 454750, Henan, China
  • Received:2025-06-02 Revised:2025-06-30 Online:2025-10-15 Published:2025-10-21

Abstract:

To clarify grain filling characteristics and yield formation mechanisms in winter wheat cultivars with different plant types, this study used loose-type YN710, semi-compact YN711, and compact-type YN712 as experimental materials, a uniform planting density (4.5×106 plants/ha) was set up to investigate their population dynamics, yield components, patterns of matter accumulation and translocation, photosynthetic characteristics, and grain filling characteristics. The results showed that the tiller number of the compact-type line at jointing was 18.7% higher than that of the loose-type line. The yield of YN712 reached 8890.70 kg/ha, which was significantly higher than that of YN711 and YN710, with yield increases of 3.58% and 1.34%, respectively. The high yield of YN712 was attributed to its highest spike number per unit area (641.60×104/ha), along with the optimal pre-anthesis dry matter translocation rate (26.86%) and nitrogen translocation rate at anthesis (73.47%). Among the photosynthetic parameters, the SPAD values during the early (r=0.833**), middle (r=0.900**), and late (r= 0.899**) grain-filling stages all exhibited highly significant positive correlation with the 1000-grain weight. Based on the correlation analysis between grain-filling characteristics and 1000-grain weight, the maximum grain-filling rate showed a highly significant positive correlation with the 1000-grain weight (r=0.83**). YN710 had the optimal grain-filling rate parameters, thereby achieving the highest 1000-grain weight (50.25 g). This study indicates that optimizing plant type, enhancing photosynthetic productivity, and coordinating spike number formation with grain-filling efficiency are key approaches for high-yield cultivation of winter wheat.

Key words: Winter wheat, Plant type, Grain filling, Photosynthetic characteristics, Dry matter translocation, Yield components

Fig.1

Changes in monthly average precipitation and temperature during the growing season of winter wheat from 2022 to 2023"

Table 1

Tiller number of winter wheat lines with different plant types ×104/hm2"

品系Line 分蘖期Tillering 拔节期Jointing 开花期Anthesis
YN710 1123±86b 1845±10b 643±45b
YN711 1256±94a 2017±12a 712±52a
YN712 1318±11a 2192±13a 782±61a

Table 2

Yield and its components of winter wheat lines with different plant types"

品系
Line
产量
Yield
(kg/hm2)
穗数
Spike number
(×104/hm2)
穗粒数
Grains per
spike
千粒重
1000-grain
weight (g)
YN710 8773.16±64.15b 491.04±26.20b 41.87±0.81b 50.25±0.29a
YN711 8583.33±67.27c 450.72±12.95c 45.60±1.35a 49.16±0.41b
YN712 8890.70±20.07a 641.60±9.01a 38.33±0.58c 42.53±0.22c

Table 3

Correlation analysis between yield and its components"

指标
Index
产量
Yield
穗数
Spike
number
穗粒数
Grains per
spike
千粒重
1000-grain
weight
产量Yield 1.000
穗数Spike number 0.690* 1.000
穗粒数Grains per spike -0.490 -0.909** 1.000
千粒重1000-grain weight -0.313 -0.587 0.733* 1.000

Table 4

Dry matter accumulation and translocation to grains of winter wheat lines with different plant types"

品系
Line
开花期
干物质积累量
Dry matter
accumulation
at anthesis (kg/hm2)
开花期
干物质转运量
Dry matter
translocation
at anthesis (kg/hm2)
成熟期
干物质积累量
Dry matter
accumulation at
maturity (kg/hm2)
花前干物质
对籽粒贡献率
Contribution rate of
pre-anthesis dry
matter to grain (%)
花后干物质
对籽粒贡献率
Contribution rate of
post-anthesis dry
matter to grain (%)
开花期
干物质转运率
Dry matter
translocation rate
at anthesis (%)
YN710 14 630.03b 3148.59b 20 266.49a 36.43a 63.57a 21.42a
YN711 13 925.36c 2710.26c 19 787.54a 31.86a 68.14a 19.32a
YN712 15 054.30a 4044.84a 19 901.43a 45.57a 54.43a 26.86a

Table 5

Nitrogen accumulation and grain distribution of winter wheat lines with different plant types"

品系
Line
开花期氮素积累量
Nitrogen
accumulation
at anthesis
(kg/hm2)
开花期氮素转运量
Nitrogen
translocation
amount at anthesis
(kg/hm2)
成熟期
氮素积累量
Nitrogen
accumulation at
maturity (kg/hm2)
花前氮素对籽粒
氮素的贡献率
Contribution rate of
pre-anthesis nitrogen
to grain nitrogen (%)
花后氮素对籽粒
氮素的贡献率
Contribution rate of
post-anthesis nitrogen
to grain nitrogen (%)
开花期氮素转运率
Nitrogen
translocation
rate at
anthesis (%)
YN710 250.70b 199.50a 273.70b 89.67a 10.33b 79.61a
YN711 218.18c 168.93b 263.56b 78.82b 21.18a 77.52a
YN712 284.65a 208.99a 309.74a 89.39a 10.61b 73.47a

Fig.2

Differences in SPAD values of flag leaves after anthesis of winter wheat lines with different plant types Different lowercase letters indicate significant differences among different lines (P < 0.05). The same below."

Fig.3

Differences in Pn after anthesis of winter wheat lines with different plant types"

Table 6

Correlation between photosynthetic parameters of flag leaves and 1000-grain weight from anthesis to maturity"

指标
Index
开花期
Anthesis
灌浆前期
Early grain-filling
灌浆中期
Middle grain-filling
灌浆后期
Late grain-filling
灌浆末期
End of grain-filling
成熟期
Maturity
SPAD 0.617 0.833** 0.900** 0.899** 0.510 0.615
Pn 0.780* 0.763* 0.780* 0.313 0.643 0.783*

Fig.4

1000-grain weight of strong and weak grain filling of winter wheat lines with different plant types A-Q: YN710 superior grain; B-Q: YN711 superior grain; C-Q: YN712 superior grain; A-R: YN710 inferior grain; B-R: YN711 inferior grain; C-R: YN712 inferior grain."

Table 7

Logistic equation parameters for grain filling of winter wheat lines with different plant types"

品系
Line
粒位
Grain position
k a b 相关系数
Correlation coefficient
YN710 强势粒 65.29 41.58 0.18 0.988**
弱势粒 54.36 53.62 0.18 0.992**
YN711 强势粒 64.35 25.28 0.17 0.993**
弱势粒 56.07 27.71 0.16 0.995**
YN712 强势粒 64.39 23.63 0.15 0.993**
弱势粒 51.20 44.12 0.18 0.982**

Table 8

Variance analysis of grain filling rate after anthesis of winter wheat lines with different plant types g/(1000粒?d) g/(1000 grains?d)"

粒位
Grain position
品系
Line
花后天数Days after anthesis
7 d 11 d 15 d 19 d 23 d 27 d 31 d 35 d 39 d
强势粒Superior grain YN710 0.72c 1.27b 2.00a 2.59a 2.64a 2.09a 1.36a 0.78a 0.41a
YN711 0.90a 1.43a 2.00a 2.37a 2.30b 1.84b 1.26a 0.77a 0.44a
YN712 0.76b 1.24b 1.79a 2.22a 2.27b 1.90ab 1.35a 0.85a 0.49a
弱势粒Inferior grain YN710 0.57c 1.08c 1.81a 2.48a 2.57a 1.99a 1.23a 0.66a 0.33ab
YN711 0.80a 1.30a 1.88a 2.27a 2.24a 1.80a 1.23a 0.75a 0.43a
YN712 0.66b 1.18b 1.84a 2.33a 2.27a 1.72a 1.07a 0.59a 0.30b

Table 9

Grain filling parameters and secondary parameters of winter wheat lines with different plant types"

品系Line Tmax Vmax T Vmean T1 T2 T3 K1 K2 K3 V1 V2 V3
YN710 21.75 2.31 42.89 1.36 13.95 14.63 14.30 12.70 34.69 11.49 0.79 2.34 0.93
YN711 20.48 2.40 44.72 1.27 12.16 16.46 16.09 12.69 34.66 11.49 0.79 2.08 0.82
YN712 21.46 2.70 45.73 1.20 13.17 16.46 16.09 12.19 33.31 11.04 0.73 2.00 0.77

Table 10

Correlation between grain filling parameters and 1000-grain weight of winter wheat lines with different plant types"

指标Index Vmax Vmean V1 V2 V3 T T1 T2 T3 K1 K2 K3 千粒重
1000-grain weight
Vmax 1.00
Vmean 0.94** 1.00
V1 0.58 0.79* 1.00
V2 1.00** 0.94** 0.59 1.00
V3 0.89** 0.94** 0.63 0.88** 1.00
T -0.57 -0.69* -0.45 -0.55 -0.88** 1.00
T1 0.55 0.24 -0.31 0.55 0.26 0.04 1.00
T2 -0.79* -0.72* -0.20 -0.78* -0.88** 0.81** -0.55 1.00
T3 -0.79* -0.72* -0.20 -0.78* -0.88** 0.82** -0.55 1.00** 1.00
K1 0.58 0.59 0.71* 0.60 0.29 0.15 0.15 0.04 0.04 1.00
K2 0.58 0.59 0.71* 0.60 0.29 0.15 0.15 0.04 0.04 1.00** 1.00
K3 0.58 0.59 0.71* 0.60 0.29 0.14 0.14 0.04 0.03 1.00** 1.00** 1.00
千粒重1000-grain weight 0.83** 0.70* 0.23 0.85** 0.57 -0.32 0.47 -0.65 -0.70 0.67* 0.67* 0.67* 1.00
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