Variation in crambe,Crambe abyssinica hochst

Abstract

One hundred sixty‐two lines were used to detect genotypic diversity for 7 characters inCrambe abyssinica Hochst during 1970 and 1972. Lines used were from 2000 randomly selected out of PI247310 and PI279345, and reselected on the basis of their progeny performance in head row nurseries. The cultivars, ‘Prophet,’ ‘Meyer,’ and ‘Indy,’ were used as checks. Characters studied were seed yield, test wt, plant ht, % oil (measured gravimetrically and by nuclear magnetic resonance), days to bloom, and % glucosinolates. Statistical differences were detected among lines for all characters except % glucosinolates, based on individual year and combined analyses of variance. Broad sense heritability estimates ranged from .22–.88. Gains from selection, as a % of the mean for each character, were estimated at 1.13–14.11. Intercharacter relationships were analyzed by correlation. The ranges in variation for traits are considered limited for good progress from selection within the germplasm represented, but advances can be expected.

Genetic variation and gain in progenies of crambe

“…(2011) and Kaefer et al (2014). Regarding the grain oil content, which is a relevant characteristic in crambe, Lessman (1975) observed values from 27.1 to 33.3% in lines of crambe evaluated in two years, being similar to the values obtained in this study.…”

“…The lack of variability in C. abyssinica reported by some authors (Lessman andMeyer 1972, Papathanasiou et al 1966) was not observed in this study. Some studies have reported the importance of crossing between the species C. abyssinica and C. hispanica to increase genetic variability in crambe (Meier and Lessman 1973).…”

“…Many authors prefer to consider negative heritability equal to zero, to avoid embarrassment in the discussion of your data, making it possible the occurrence of negative heritability when the variance is low (Lynch and Walsh 1998) or when the magnitude of the environmental variance is very high. Lessman (1975) found heritability coefficients of 24, 45, and 88%, respectively, for the grain oil content, grain weight, and grain yield in crambe lines obtained by the same selection method used in this research. On a research conducted by Vollmann and Ruckenbauer (1993), the heritability coefficients ranged 19-69%.…”

“…Mastebroek et al (1994) obtained 15% of genetic gain for grain yield with the selection of lines of crambe from Europe. Lessman (1975) obtained expected genetic gains of 1.13% for oil content, 14.11% for grain weight, and 6.69% for grain yield with the selection of individual plants. On common bean crop, Santos et al (2002) observed genetic gains varying from 0.63 to 16.09% using the same selection method.…”

“…There is no correct number of plants to select in the method of individual selection with progeny test, although the chances of finding superior genotypes increase with greater number of selected plants. Lessman (1975) used the method of individual selection with progeny test in C. abyssinica and selected 162 lines. The author evaluated the genetic variability based on the characteristics of plant height, oil content, test weight, yield, days to bloom and glucosinolate content, and found significant differences, except for the glucosinolate content.…”