Crops ›› 2023, Vol. 39 ›› Issue (2): 106-114.doi: 10.16035/j.issn.1001-7283.2023.02.015

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Comparison of Carbohydrate and Nitrogen Contents in Vegetative Organs between Early- and Middle-Maturing Cotton Lines and the Relationships to Dry Matter Accumulation

Wang Yandan(), Gao Xin, Peng Jinjian, Tang Feiyu()   

  1. College of Agronomy, Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Nanchang 330045, Jiangxi, China
  • Received:2021-08-06 Revised:2021-10-15 Online:2023-04-15 Published:2023-04-11

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Abstract:

In order to explore the correlation in dry matter accumulation and yield between cotton cultivars differing in growth period and its carbon and nitrogen metabolism, two near-isogenic cotton lines with different growth period were employed to examine the single plant total nitrogen, amino acid, and nonstructural carbohydrates (hexose, sucrose, and starch) contents in the roots, stems and leaves and the biomass of various plant organs during squaring to boll opening stages. The differences between two lines were compared. The correlation between the nitrogen content and biomass was analyzed. The results showed that 4003-6 exhibited greater boll weight, lint per centage and lint cotton yield than 4003-10. The leaves per plant recorded higher total nitrogen, amino acid, total nonstructural carbohydrate, starch contents and carbon to nitrogen ratio in 4003-6 than in 4003-10 at reproductive growth stage, which means the former expressed greater activities of carbon and nitrogen metabolism and produced more carbohydrates. Greater amino acid content with roots and higher nitrogen uptake efficiency were found in 4003-6 than in 4003-10. Among vegetative organs, root nitrogen contents brought the greatest effects to each of the biomass of shoots, roots, vegetative and reproductive organs. The correlation coefficients between nitrogen content per plant in roots, stems and leaves and reproductive biomass per plant were greater in 4003-10 than in 4003-6, indicating the nitrogen absorbing ability of early maturing line affected yield more than that of middle maturing line.

Key words: Cotton (Gossypium hirsutum L.), Total nitrogen, Nonstructural carbohydrate, Amino acid, Carbon to nitrogen ratio, Growth period

Table 1

Performances of yield and its components in early maturing line 4003-10 and medium maturing line 4003-6"

年份
Year		 品系
Line		 株铃数
Bolls per
plant		 单铃重
Boll weight
(g)		 衣分
Lint percentage
(%)		 子指
Seed index
(g)		 衣指
Lint index
(g)		 子棉产量
Seed cotton yield
(kg/hm2)		 皮棉产量
Lint cotton yield
(kg/hm2)
2017 4003-10 38.1a 4.4a 37.2b 10.4a 6.2b 2658.0a 991.0a
4003-6 39.7a 4.7a 39.9a 10.5a 7.0a 2661.4a 1063.6a
2018 4003-10 30.4a 3.9b 39.0b 10.1a 6.5b 2345.9b 913.7b
4003-6 28.5a 4.6a 41.2a 10.1a 7.1a 2737.0a 1126.9a

Fig.1

Changes of nitrogen contents in the main stems (a, b), roots (c, d) and leaves (e, f) in cotton early maturing line 4003-10 and medium maturing line 4003-6 “*”and“**”indicate significant difference at P < 0.05 and P < 0.01 levels, respectively. The same below"

Fig.2

Changes of amino acid contents in the main stems (a, b), roots (c, d) and leaves (e, f) in cotton early maturing line 4003-10 and medium maturing line 4003-6"

Fig.3

Comparison of nitrogen uptake efficiency between cotton early maturing line 4003-10 and medium maturing line 4003-6"

Fig.4

Changes of total nonstructural carbohydrate contents in the main stems (a, b)，roots (c, d)and leaves (e, f) in cotton early maturing line 4003-10 and medium maturing line 4003-6"

Fig.5

Changes of sucrose contents in the main stems (a, b), roots (c, d) and leaves (e, f) in cotton early maturing line 4003-10 and medium maturing line 4003-6"

Fig.6

Changes of starch contents in the main stems (a, b), roots (c, d) and leaves (e, f) in cotton early maturing line 4003-10 and medium maturing line 4003-6"

Fig.7

Changes of nitrogen to carbon ratio in the main stems (a, b), roots (c, d) and leaves (e, f) in cotton early maturing line 4003-10 and medium maturing line 4003-6"

Table 2

Correlation coefficients between root, stem, leaf N content per plant and root biomass, shoot biomass, vegetative biomass and reproductive biomass per plant in lines 4003-10 and 4003-6 during reproductive growth period"

年份Year 品系Line 变量Variable 根含氮量Root nitrogen content 茎含氮量Stem nitrogen content 叶含氮量Leaf nitrogen content
2017 4003-10 根系生长量 0.961** 0.906** 0.904**
地上部生长量 0.949** 0.906** 0.858**
营养器官生长量 0.971** 0.954** 0.943**
生殖器官生长量 0.875** 0.803** 0.726**
4003-6 根生物量 0.968** 0.917** 0.925**
地上部生长量 0.921** 0.855** 0.864**
营养器官生长量 0.971** 0.935** 0.938**
生殖器官生长量 0.799** 0.691** 0.712**
2018 4003-10 根生物量 0.900** 0.900** 0.643**
地上部生长量 0.927** 0.938** 0.787**
营养器官生长量 0.905** 0.941** 0.760**
生殖器官生长量 0.924** 0.903** 0.772**
4003-6 根生物量 0.911** 0.827** 0.755**
地上部生长量 0.867** 0.848** 0.837**
营养器官生长量 0.872** 0.849** 0.857**
生殖器官生长量 0.851** 0.823** 0.769**
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