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Silicon-mediated resistance in a susceptible rice variety to the rice leaf folder, Cnaphalocrocis medinalis Guenée (Lepidoptera: Pyralidae).

Han Y, Lei W, Wen L, Hou M - PLoS ONE (2015)

Bottom Line: Silicon addition to rice plants at both the low and high rates significantly extended larval development and reduced larval survival rate and pupation rate in the rice leaf folder.Although the third instars consumed more in silicon-amended treatments, C:N ratio in rice leaves was significantly increased and food conversion efficiencies were reduced due to increased silicon concentration in rice leaves.Our results indicate that reduced food quality and food conversion efficiencies resulted from silicon addition account for the enhanced resistance in the susceptible rice variety to the rice leaf folder.

View Article: PubMed Central - PubMed

Affiliation: College of Plant Protection, Hunan Agricultural University, Changsha, Hunan Province, China; State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Haidian, Beijing, China.

ABSTRACT
The rice leaf folder, Cnaphalocrocis medinalis (Guenée), is one of the most destructive rice pests in Asian countries. Rice varieties resistant to the rice leaf folder are generally characterized by high silicon content. In this study, silicon amendment, at 0.16 and 0.32 g Si/kg soil, enhanced resistance of a susceptible rice variety to the rice leaf folder. Silicon addition to rice plants at both the low and high rates significantly extended larval development and reduced larval survival rate and pupation rate in the rice leaf folder. When applied at the high rate, silicon amendment reduced third-instars' weight gain and pupal weight. Altogether, intrinsic rate of increase, finite rate of increase and net reproduction rate of the rice leaf folder population were all reduced at both the low and high silicon addition rates. Although the third instars consumed more in silicon-amended treatments, C:N ratio in rice leaves was significantly increased and food conversion efficiencies were reduced due to increased silicon concentration in rice leaves. Our results indicate that reduced food quality and food conversion efficiencies resulted from silicon addition account for the enhanced resistance in the susceptible rice variety to the rice leaf folder.

No MeSH data available.


Related in: MedlinePlus

Effects of silicon addition to rice plants (TN1) on food consumption efficiency in third instars of Cnaphalocrocis medinalis.A: Food consumed, B: relative consumption rate (RCR), C: relative growth rate (RGR), D: approximate digestibility (AD), E: efficiency of conversion of ingested food (ECI), F: efficiency of conversion of digested food (ECD). Values are expressed as means ± SE. Bars with different letters are significantly different (Tukey’s multiple range test, P = 0.05). Numbers in bars indicate replications.
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pone.0120557.g003: Effects of silicon addition to rice plants (TN1) on food consumption efficiency in third instars of Cnaphalocrocis medinalis.A: Food consumed, B: relative consumption rate (RCR), C: relative growth rate (RGR), D: approximate digestibility (AD), E: efficiency of conversion of ingested food (ECI), F: efficiency of conversion of digested food (ECD). Values are expressed as means ± SE. Bars with different letters are significantly different (Tukey’s multiple range test, P = 0.05). Numbers in bars indicate replications.

Mentions: Si addition at the high rate significantly increased (by 98.5%) the amount of food consumed by rice leaf folder third instars (F = 7.31, df = 2,50, P = 0.002; Fig. 3A) over the control. The relative consumption rate (RCR) at the high Si addition rate was 129.8% higher than in the control (F = 10.93, df = 2,50, P < 0.001; Fig. 3B). No significant differences were observed for both the relative growth rate (RGR) (F = 0.774, df = 2,50, P = 0.466; Fig. 3C) and approximate digestibility (AD) (F = 0.91, df = 2,50, P = 0.408; Fig. 3D) between the treatments. Si amendment significantly reduced the efficiency of conversion of ingested food (ECI) (F = 16.91, df = 2,50, P < 0.001; Fig. 3E) and efficiency of conversion of digested food (ECD) (F = 7.07, df = 2,48, P = 0.002; Fig. 3F) in the third instars. ECI was 18.0% and 13.1% lower at the high and low Si addition rates, respectively, than in the control. For ECD, these reductions were 27.4% and 25.1%, respectively.


Silicon-mediated resistance in a susceptible rice variety to the rice leaf folder, Cnaphalocrocis medinalis Guenée (Lepidoptera: Pyralidae).

Han Y, Lei W, Wen L, Hou M - PLoS ONE (2015)

Effects of silicon addition to rice plants (TN1) on food consumption efficiency in third instars of Cnaphalocrocis medinalis.A: Food consumed, B: relative consumption rate (RCR), C: relative growth rate (RGR), D: approximate digestibility (AD), E: efficiency of conversion of ingested food (ECI), F: efficiency of conversion of digested food (ECD). Values are expressed as means ± SE. Bars with different letters are significantly different (Tukey’s multiple range test, P = 0.05). Numbers in bars indicate replications.
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4383528&req=5

pone.0120557.g003: Effects of silicon addition to rice plants (TN1) on food consumption efficiency in third instars of Cnaphalocrocis medinalis.A: Food consumed, B: relative consumption rate (RCR), C: relative growth rate (RGR), D: approximate digestibility (AD), E: efficiency of conversion of ingested food (ECI), F: efficiency of conversion of digested food (ECD). Values are expressed as means ± SE. Bars with different letters are significantly different (Tukey’s multiple range test, P = 0.05). Numbers in bars indicate replications.
Mentions: Si addition at the high rate significantly increased (by 98.5%) the amount of food consumed by rice leaf folder third instars (F = 7.31, df = 2,50, P = 0.002; Fig. 3A) over the control. The relative consumption rate (RCR) at the high Si addition rate was 129.8% higher than in the control (F = 10.93, df = 2,50, P < 0.001; Fig. 3B). No significant differences were observed for both the relative growth rate (RGR) (F = 0.774, df = 2,50, P = 0.466; Fig. 3C) and approximate digestibility (AD) (F = 0.91, df = 2,50, P = 0.408; Fig. 3D) between the treatments. Si amendment significantly reduced the efficiency of conversion of ingested food (ECI) (F = 16.91, df = 2,50, P < 0.001; Fig. 3E) and efficiency of conversion of digested food (ECD) (F = 7.07, df = 2,48, P = 0.002; Fig. 3F) in the third instars. ECI was 18.0% and 13.1% lower at the high and low Si addition rates, respectively, than in the control. For ECD, these reductions were 27.4% and 25.1%, respectively.

Bottom Line: Silicon addition to rice plants at both the low and high rates significantly extended larval development and reduced larval survival rate and pupation rate in the rice leaf folder.Although the third instars consumed more in silicon-amended treatments, C:N ratio in rice leaves was significantly increased and food conversion efficiencies were reduced due to increased silicon concentration in rice leaves.Our results indicate that reduced food quality and food conversion efficiencies resulted from silicon addition account for the enhanced resistance in the susceptible rice variety to the rice leaf folder.

View Article: PubMed Central - PubMed

Affiliation: College of Plant Protection, Hunan Agricultural University, Changsha, Hunan Province, China; State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Haidian, Beijing, China.

ABSTRACT
The rice leaf folder, Cnaphalocrocis medinalis (Guenée), is one of the most destructive rice pests in Asian countries. Rice varieties resistant to the rice leaf folder are generally characterized by high silicon content. In this study, silicon amendment, at 0.16 and 0.32 g Si/kg soil, enhanced resistance of a susceptible rice variety to the rice leaf folder. Silicon addition to rice plants at both the low and high rates significantly extended larval development and reduced larval survival rate and pupation rate in the rice leaf folder. When applied at the high rate, silicon amendment reduced third-instars' weight gain and pupal weight. Altogether, intrinsic rate of increase, finite rate of increase and net reproduction rate of the rice leaf folder population were all reduced at both the low and high silicon addition rates. Although the third instars consumed more in silicon-amended treatments, C:N ratio in rice leaves was significantly increased and food conversion efficiencies were reduced due to increased silicon concentration in rice leaves. Our results indicate that reduced food quality and food conversion efficiencies resulted from silicon addition account for the enhanced resistance in the susceptible rice variety to the rice leaf folder.

No MeSH data available.


Related in: MedlinePlus