Host plant resistance in sugarcane Saccharum officinarum to the lophopid planthopper Pyrilla perpusilla Walker (Homoptera: Lophopidae)
Host plant resistance in sugarcane Saccharum officinarum to the lophopid planthopper Pyrilla perpusilla Walker (Homoptera: Lophopidae)
Morphological and bio-chemical bases of resistance of sugarcane to the serious sucking pest Pyrilla perpusilla were studied on a wide genetic range of sugarcane cultivars that originated from different geographical regions of the world. Leaf morphological characteristics; spine density, thickness of phloem fibre tissues in a minor and the main vascular bundle, distance to the phloem from the epidermis in a minor and the main vascular bundles, width of the leaf blade and the main vein were found to determine the growth rate of 1st instars (84.43% of the variance) and 3rd instars (31.97% of the variance) of P. perpusilla. The most important characteristics were spine density [x1](r= 0.8805) and thickness of the phloem fibre layer in the minor vascular bundle [x2](r= 0.5500) which determined up to 82.77% of the variance of mean relative growth rate (MRGR) of 1st instar stage according to the regression model Y = 0.16696-0.00178X1-0.29105X2.
Two hydroxamic acids DIBOA and DIMBOA found in sugarcane leaves (0.0136- 1.5501 mmol/Kg and 0.0243 - 3.0250 mmol/Kg concentrations respectively) had no impact on the growth or the duration of life stages of P. perpusilla. Subsequent work on distribution of hydroxamic acids in different parts of leaves and different leaves of plants revealed higher levels at the base and the middle of younger leaves compared to other parts.
The antixenotic effect of morphological and chemical characteristics of selected cultivars on feeding and oviposition of P. perpusilla revealed that feeding preference was determined by the leaf colour (X2 = 10.2; P< 0.05) and Hx levels (X2 = 21.668; P< 0.05); whereas oviposition preference was determined by leaf spine density (X2 = 8.959; P< 0.05) and Hx levels (X2 = 12.584; P< 0.05).
University of Southampton
Kumarasinghe, Nimal Chandrakantha
1994
Kumarasinghe, Nimal Chandrakantha
Kumarasinghe, Nimal Chandrakantha
(1994)
Host plant resistance in sugarcane Saccharum officinarum to the lophopid planthopper Pyrilla perpusilla Walker (Homoptera: Lophopidae).
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Morphological and bio-chemical bases of resistance of sugarcane to the serious sucking pest Pyrilla perpusilla were studied on a wide genetic range of sugarcane cultivars that originated from different geographical regions of the world. Leaf morphological characteristics; spine density, thickness of phloem fibre tissues in a minor and the main vascular bundle, distance to the phloem from the epidermis in a minor and the main vascular bundles, width of the leaf blade and the main vein were found to determine the growth rate of 1st instars (84.43% of the variance) and 3rd instars (31.97% of the variance) of P. perpusilla. The most important characteristics were spine density [x1](r= 0.8805) and thickness of the phloem fibre layer in the minor vascular bundle [x2](r= 0.5500) which determined up to 82.77% of the variance of mean relative growth rate (MRGR) of 1st instar stage according to the regression model Y = 0.16696-0.00178X1-0.29105X2.
Two hydroxamic acids DIBOA and DIMBOA found in sugarcane leaves (0.0136- 1.5501 mmol/Kg and 0.0243 - 3.0250 mmol/Kg concentrations respectively) had no impact on the growth or the duration of life stages of P. perpusilla. Subsequent work on distribution of hydroxamic acids in different parts of leaves and different leaves of plants revealed higher levels at the base and the middle of younger leaves compared to other parts.
The antixenotic effect of morphological and chemical characteristics of selected cultivars on feeding and oviposition of P. perpusilla revealed that feeding preference was determined by the leaf colour (X2 = 10.2; P< 0.05) and Hx levels (X2 = 21.668; P< 0.05); whereas oviposition preference was determined by leaf spine density (X2 = 8.959; P< 0.05) and Hx levels (X2 = 12.584; P< 0.05).
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Published date: 1994
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Local EPrints ID: 458393
URI: http://eprints.soton.ac.uk/id/eprint/458393
PURE UUID: 54b84d4b-60b1-48d9-ba4f-f6c416121fa8
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Date deposited: 04 Jul 2022 16:48
Last modified: 04 Jul 2022 16:48
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Author:
Nimal Chandrakantha Kumarasinghe
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