The Photosynthesis and Growth Characteristics of Two Sugarcane Cultivars in Different Phosphorus Rate Condition

doi:10.3969/j.issn.1000-2561.2019.06.011

Abstract

Abstract:

The aim was to select phosphorus (P) efficient sugarcane variety and to apply P fertilizer scientifically after investigating the photosynthesis mechanism regulated by phosphorus. Using sugarcane varieties ROC22 and YT236, three levels of P supply were set in the study. The plant height and biomass of ROC22 and YT236 significantly increased with increasing P supply. The plant height of ROC22 was significantly higher than that of YT236 after the plants were cultivated in the nutrient solution for 60 days. The biomass of ROC22 with P application of 1 mmol/L was significantly higher than that of YT236, and the fresh weight and dry weight of ROC22 increased 1.6 fold and 1.4 fold compared to YT236. The total chlorophyll (Chl), net photosynthetic rate (P_n) intercellular CO₂ concentration (C_i), transpiration rate (T_r) and stomatal conductance (G_s) of ROC22 significantly increased with increasing P supply. P_n, C_i, T_r and G_s of YT236 with P application of 0.1 and 1 mmol/L were significantly higher than that without P application. Chl of YT236 with P application of 1 mmol/L was significantly higher than that without P application and with 0.1 mmol/L P application. Chl of ROC22 with P application of 0.1 and 1 mmol/L increased by 16% and 14% compared to YT236, respectively. P_n of ROC22 with 3 levels of P supply was significantly higher than that of YT236. C_i of ROC22 with 1 mmol/L P application was significantly higher than that of YT236. T_r and G_s of ROC22 without P application were significantly higher than that of YT236. Considering the photosynthesis and growth of sugarcane, the optimum level of P supply for ROC22 and YT236 was 1 mmol/L. The photosynthesis and growth of ROC22 in the study area was obviously better than that of YT236, so ROC22 was suggested to be planted in the study area and the phosphorus deficiency soil.

Key words: Saccharum officinarum L., biomass, phosphorus, photosynthesis

CLC Number:

S566.1

LI Jin,DUAN Tingting,ZHENG Chao,LIN Zhong,LIANG Yanqiu,GAO Yu,DENG Kai. The Photosynthesis and Growth Characteristics of Two Sugarcane Cultivars in Different Phosphorus Rate Condition[J]. Chinese Journal of Tropical Crops, 2019, 40(6): 1108-1114.

Figures/Tables 7

Fig. 1 The plant height of ROC22 and YT236 for different P rate condition

Tab. 1 The plant biomass of two sugarcane cultivars for different P rate condition g

供磷量 P quantities	ROC22		YT236
供磷量 P quantities	鲜重Fresh weight	干重Dry weight	鲜重Fresh weight	干重Dry weight
P₀	16.83±3.26^c	3.88±0.45^c	15.37±0.78^c	4.48±0.44^c
P_0.1	205.87±68.68^b	45.51±16.94^b	147.53±14.93^b	36.91±4.43^b
P₁	395.93±62.83^a*	82.65±10.31^a*	247.07±6.31^a	60.20±2.47^a

Tab. 2 The chlorophyll content of two sugarcane cultivars for different P rate condition mg?g-1

供磷量 P quantities	ROC22			YT236
供磷量 P quantities	叶绿素a Chl a	叶绿素b Chl b	叶绿素总量 Chl	叶绿素a Chl a	叶绿素b Chl b	叶绿素总量 Chl
P₀	13.18±0.64^c	3.47±0.36^b	16.65±0.56^c	12.34±0.93^a	4.55±0.26^b	16.89±1.18^b
P_0.1	14.50±0.65^b*	4.43±0.59^ab	18.93±1.23^b*	11.90±0.56^a	4.42±0.31^b	16.31±0.85^b
P₁	16.20±0.36^a*	5.40±1.00^a	21.60±1.06^a*	13.32±0.73^a	5.57±0.20^a	18.89±0.93^a

Fig. 2 The net photosynthetic rate of two sugarcane cultivars for different P rate condition Different small letters indicate significant differences among phosphorus rate treatments for the same varieties condition. “ * ” meant significant differences between the two sugarcane varieties treatments for the same phosphorus rate condition (DMRT, P<0.05, n=3).

Fig. 3 The intercellular CO2 concentration of two sugarcane cultivars for different P rate condition Different small letters indicate significant differences among phosphorus rate treatments for the same varieties condition. “ * ” meant significant differences between the two sugarcane varieties treatments for the same phosphorus rate condition (DMRT, P<0.05, n=3).

Fig. 4 The stomatal conductance of two sugarcane cultivars for different P rate condition Different small letters indicate significant differences among phosphorus rate treatments for the same varieties condition. “ * ” meant significant differences between the two sugarcanevarieties treatments for the same phosphorus rate condition (DMRT, P<0.05, n=3).

Fig. 5 The transpiration rate of two sugarcane cultivars for different P rate condition Different small letters indicate significant differences among phosphorus rate treatments for the same varieties condition. “ * ” meant significant differences between the two sugarcane varieties treatments for the same phosphorus rate condition (DMRT, P<0.05, n=3).

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