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Ideotype population exploration: growth, photosynthesis, and yield components at different planting densities in winter oilseed rape (Brassica napus L.).

Ma N, Yuan J, Li M, Li J, Zhang L, Liu L, Naeem MS, Zhang C - PLoS ONE (2014)

Bottom Line: Our results indicated that planting densities of 58.5×10(4) plants ha(-1) in ZS11 and 48.0×10(4) plants ha(-1) in HYZ9 have significantly higher yield compared with the density of 27.0×10(4) plants ha(-1) for both varieties.A significantly higher level of silique wall photosynthesis and rapid dry matter accumulation were supposed to result in the maximum seed yield.Our results suggest that increasing the planting density within certain range is a feasible approach for higher seed yield in winter rapeseed in China.

View Article: PubMed Central - PubMed

Affiliation: Oil Crops Research Institute Chinese Academy of Agricultural Science, Key Laboratory of Oil Crop Biology of the Ministry of Agriculture, Key Laboratory of Crop Cultivation and Physiology, Ministry of Agriculture, Wuhan, China.

ABSTRACT
Rapeseed is one of the most important edible oil crops in the world and the seed yield has lagged behind the increasing demand driven by population growth. Winter oilseed rape (Brassica napus L.) is widely cultivated with relatively low yield in China, so it is necessary to find the strategies to improve the expression of yield potential. Planting density has great effects on seed yield of crops. Hence, field experiments were conducted in Wuhan in the Yangtze River basin with one conventional variety (Zhongshuang 11, ZS11) and one hybrid variety (Huayouza 9, HYZ9) at five planting densities (27.0×10(4), 37.5×10(4), 48.0×10(4), 58.5×10(4), 69.0×10(4) plants ha(-1)) during 2010-2012 to investigate the yield components. The physiological traits for high-yield and normal-yield populations were measured during 2011-2013. Our results indicated that planting densities of 58.5×10(4) plants ha(-1) in ZS11 and 48.0×10(4) plants ha(-1) in HYZ9 have significantly higher yield compared with the density of 27.0×10(4) plants ha(-1) for both varieties. The ideal silique numbers for ZS11 and HYZ9 were ∼0.9×10(4) (n m(-2)) and ∼1×10(4) (n m(-2)), respectively, and ideal primary branches for ZS11 and HYZ9 were ∼250 (n m(-2)) and ∼300 (n m(-2)), respectively. The highest leaf area index (LAI) and silique wall area index (SAI) was ∼5.0 and 7.0, respectively. Moreover, higher leaf net photosynthetic rate (Pn) and water use efficiency (WUE) were observed in the high-yield populations. A significantly higher level of silique wall photosynthesis and rapid dry matter accumulation were supposed to result in the maximum seed yield. Our results suggest that increasing the planting density within certain range is a feasible approach for higher seed yield in winter rapeseed in China.

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Seed yield of ZS11 and HYZ9 in 2010–2011 and 2011–2012 growing seasons.(A) The seed yield of ZS11 and HYZ9 in 2010–2011. (B) The seed yield of ZS11 and HYZ9 in 2011–2012. The planting densities were designed as D1, 27.0×104 plants ha-1; D2, 37.5×104 plants ha-1; D3, 48.0×104 plants ha-1; D4, 58.5×104 plants ha-1; D5, 69.0×104 plants ha-1. Different lower case letters indicate significant pairwise differences between means (p<0.05; Duncan's test).
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pone-0114232-g001: Seed yield of ZS11 and HYZ9 in 2010–2011 and 2011–2012 growing seasons.(A) The seed yield of ZS11 and HYZ9 in 2010–2011. (B) The seed yield of ZS11 and HYZ9 in 2011–2012. The planting densities were designed as D1, 27.0×104 plants ha-1; D2, 37.5×104 plants ha-1; D3, 48.0×104 plants ha-1; D4, 58.5×104 plants ha-1; D5, 69.0×104 plants ha-1. Different lower case letters indicate significant pairwise differences between means (p<0.05; Duncan's test).

Mentions: On the bases of the first experiment, the second experiment was conducted in 2011–2012 and 2012–2013 to study the physiological traits of different populations. As the relatively low seed yield was observed at a planting density of 27.0×104 plants ha–1, it was referred as the traditionally normal yield population. However, the highest seed yield was obtained at increasing planting densities in the first experiment, 58.5×104 plants ha–1 and 48.0×104 plants ha–1 were referred as high yield population in ZS11 and HYZ9, respectively (Fig. 1). In 2012–2013, the seeds were sown on 28 September 2012 by using densities of high-yield and normal-yield populations, as described above. A randomized complete block design with three replicates was established, and 12 plots were designed for the two varieties. The plot area was 2 m long ×10 cm wide and consisted of 30 rows. A 1m wide border was left around each plot. The rates of application of N, P2O5, and K2O were the same as those in the first experiment.


Ideotype population exploration: growth, photosynthesis, and yield components at different planting densities in winter oilseed rape (Brassica napus L.).

Ma N, Yuan J, Li M, Li J, Zhang L, Liu L, Naeem MS, Zhang C - PLoS ONE (2014)

Seed yield of ZS11 and HYZ9 in 2010–2011 and 2011–2012 growing seasons.(A) The seed yield of ZS11 and HYZ9 in 2010–2011. (B) The seed yield of ZS11 and HYZ9 in 2011–2012. The planting densities were designed as D1, 27.0×104 plants ha-1; D2, 37.5×104 plants ha-1; D3, 48.0×104 plants ha-1; D4, 58.5×104 plants ha-1; D5, 69.0×104 plants ha-1. Different lower case letters indicate significant pairwise differences between means (p<0.05; Duncan's test).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4269386&req=5

pone-0114232-g001: Seed yield of ZS11 and HYZ9 in 2010–2011 and 2011–2012 growing seasons.(A) The seed yield of ZS11 and HYZ9 in 2010–2011. (B) The seed yield of ZS11 and HYZ9 in 2011–2012. The planting densities were designed as D1, 27.0×104 plants ha-1; D2, 37.5×104 plants ha-1; D3, 48.0×104 plants ha-1; D4, 58.5×104 plants ha-1; D5, 69.0×104 plants ha-1. Different lower case letters indicate significant pairwise differences between means (p<0.05; Duncan's test).
Mentions: On the bases of the first experiment, the second experiment was conducted in 2011–2012 and 2012–2013 to study the physiological traits of different populations. As the relatively low seed yield was observed at a planting density of 27.0×104 plants ha–1, it was referred as the traditionally normal yield population. However, the highest seed yield was obtained at increasing planting densities in the first experiment, 58.5×104 plants ha–1 and 48.0×104 plants ha–1 were referred as high yield population in ZS11 and HYZ9, respectively (Fig. 1). In 2012–2013, the seeds were sown on 28 September 2012 by using densities of high-yield and normal-yield populations, as described above. A randomized complete block design with three replicates was established, and 12 plots were designed for the two varieties. The plot area was 2 m long ×10 cm wide and consisted of 30 rows. A 1m wide border was left around each plot. The rates of application of N, P2O5, and K2O were the same as those in the first experiment.

Bottom Line: Our results indicated that planting densities of 58.5×10(4) plants ha(-1) in ZS11 and 48.0×10(4) plants ha(-1) in HYZ9 have significantly higher yield compared with the density of 27.0×10(4) plants ha(-1) for both varieties.A significantly higher level of silique wall photosynthesis and rapid dry matter accumulation were supposed to result in the maximum seed yield.Our results suggest that increasing the planting density within certain range is a feasible approach for higher seed yield in winter rapeseed in China.

View Article: PubMed Central - PubMed

Affiliation: Oil Crops Research Institute Chinese Academy of Agricultural Science, Key Laboratory of Oil Crop Biology of the Ministry of Agriculture, Key Laboratory of Crop Cultivation and Physiology, Ministry of Agriculture, Wuhan, China.

ABSTRACT
Rapeseed is one of the most important edible oil crops in the world and the seed yield has lagged behind the increasing demand driven by population growth. Winter oilseed rape (Brassica napus L.) is widely cultivated with relatively low yield in China, so it is necessary to find the strategies to improve the expression of yield potential. Planting density has great effects on seed yield of crops. Hence, field experiments were conducted in Wuhan in the Yangtze River basin with one conventional variety (Zhongshuang 11, ZS11) and one hybrid variety (Huayouza 9, HYZ9) at five planting densities (27.0×10(4), 37.5×10(4), 48.0×10(4), 58.5×10(4), 69.0×10(4) plants ha(-1)) during 2010-2012 to investigate the yield components. The physiological traits for high-yield and normal-yield populations were measured during 2011-2013. Our results indicated that planting densities of 58.5×10(4) plants ha(-1) in ZS11 and 48.0×10(4) plants ha(-1) in HYZ9 have significantly higher yield compared with the density of 27.0×10(4) plants ha(-1) for both varieties. The ideal silique numbers for ZS11 and HYZ9 were ∼0.9×10(4) (n m(-2)) and ∼1×10(4) (n m(-2)), respectively, and ideal primary branches for ZS11 and HYZ9 were ∼250 (n m(-2)) and ∼300 (n m(-2)), respectively. The highest leaf area index (LAI) and silique wall area index (SAI) was ∼5.0 and 7.0, respectively. Moreover, higher leaf net photosynthetic rate (Pn) and water use efficiency (WUE) were observed in the high-yield populations. A significantly higher level of silique wall photosynthesis and rapid dry matter accumulation were supposed to result in the maximum seed yield. Our results suggest that increasing the planting density within certain range is a feasible approach for higher seed yield in winter rapeseed in China.

Show MeSH