INDEXES OF ROOT SYSTEM DEVELOPMENT FOR BARLEY EDAPHIC BREEDING
2018
Е.М. Lisitsyn
Complex genetic control of parameters of plant resistance to abiotic stressors make it necessary to use integral physiological indexes of root system activity during plant edaphic breed- ing. However, until now available models of cereal varieties do not contain any parameters of de- velopment of root systems. In the given article, integral physiological indexes of spring barley eco- logical resistance are proposed which one allows to select perspective genotypes for crossing during breeding for acid- or aluminum-resistance on the example of seven varieties and 13 selection lines of spring barley. These indexes (relative mass ratio root/shoot; oxidizing activity of roots; transpi- ration intensity expressed per gram of dry root weight) have wide genotypic variation but relatively weak link with integral resistance parameter – root tolerance index. Coefficients of pair correlation were correspondly -0.228; 0.186 and 0.168, at the same time they are not significant statistically at level р ≤ 0.05. Index of relative ratio root-to-shoot varied from 16.5% decreasing (selection line 177-07) up to 29% increasing (selection line 53-08). Change in oxidizing activity of roots are marked both in lowering direction (up to 69% of control mean, selection line 33-11), and in rising direction (up to 34% higher than control mean, variety Sunshine). Variability of relative index of transpiration intensity was 40% (from 43.76% for selection line 484-09 up to 198% for selection line 52-12 at average value 109% from control mean). Use of these four indexes allows to make complex estimation of activity of root systems under condition of stress impact.
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