Evaluation of Brassica genotypes for resistance to shatter. I. Development of a laboratory test |
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| Authors: | G P Kadkol R H Macmillan R P Burrow G M Halloran |
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| Institution: | (1) School of Agriculture and Forestry, University of Melbourne, 3052 Parkville, Victoria, Australia;(2) Agricultural Engineering Section, Department of Civil Engineering, University of Melbourne, 3052 Parkville, Victoria, Australia |
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| Abstract: | Summary A new test procedure for measuring shatter-resistance of siliquae of Brassica spp. is described. A siliqua with its proximal end clamped is loaded as a cantilever in a testing machine. The maximum bending moment, the corresponding stiffness and the energy to cause the siliqua to rupture were taken as measures of the resistance of the siliqua to shatter. Studies showed that ranking of accessions based on either bending moment or energy closely approximated the rankings based on observations of field shatter. A reasonably high significant negative correlation was found between percentage of shattered siliquae and both bending moment and energy (r=–0.595 and –0.531 respecitvely, P=0.001). The above results indicated that bending moment and energy could be used as criteria in evaluating rapeseed genotypes for shatter-resistance in breeding programmes. |
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| Keywords: | Brassica spp shatter-resistance siliqua strength field shatter |
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