Rib Discoloration in F2 Populations of Crisphead Lettuce in Relation to Head Maturity

Jenni, Sylvie; Koeyer, David De; Emery, G. C.

doi:10.21273/jashs.133.2.249

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…The development of the symptoms has been directly associated with heat stress, the highest incidence being observed in controlled environments when the stress was applied 2 weeks after heading (Jenni 2005). As for tipburn, rib discolouration is strongly associated with advanced maturity and the resistance to the disorder varies among varieties and breeding lines (Jenkins 1962, Jenni et al. 2008).…”

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Genotype by environment interactions of heat stress disorder resistance in crisphead lettuce

Jenni

Yan

2009

Plant Breeding

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Lettuce is a cool season crop susceptible to physiological disorders when exposed to supra optimal temperatures. Genotype (G) by environment (E) interaction (GE) of rib discolouration, tipburn, premature bolting and ribbiness in crisphead lettuce was characterized under high temperature and long day growing conditions. Replicated data of 10 crisphead lettuce varieties from two plantings in each of four growing seasons at two locations in Quebec were analysed using the GGE biplot method. Head-weight-over-stem-length ratio, ribbiness, rib discolouration incidence and tipburn incidence were affected (P = 0.00001) by E, G and GE. E explained more variation in headweight-over-stem-length ratio (77.1%) and rib discolouration incidence (77.3%) than G and GE, whereas GE explained more variation (72.4%) in tipburn incidence and G explained more variation (38%) in ribbiness. Strong crossover GE was detected with rib discolouration and tipburn incidence, but not with head-weight-over-stem-length ratio and ribbiness. Under heat stress, varieties of the Vanguard group had lower ribbiness than those of the Great Lakes group. Cultivar ÔEstivalÕ showed consistent resistance to bolting, ribbiness, tipburn and rib discolouration across all E.

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Genotype by environment interactions of heat stress disorder resistance in crisphead lettuce

Jenni

Yan

2009

Plant Breeding

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“…According to Farmers, plant growth rates varies considerably, and the approximate days after emergence for a given leaf stage to appear is influenced most by temperature. Temperature extremes can impose major limitations on crop productivity and production in some areas (Figure 3) [7]. Cultivars 1,2,7,8 and control developed 5 leaves, 75 days after seedling emergence.…”

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Morphological characterization of cultivars collection of Lettuce (Lactuca sativa L.) from Tunisian oasis

Loumerem¹,

Abdelkader²,

Tlahig³

2019

Integr Food Nutr Metab

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Eight cultivars (CV) of lettuce, collected from Chenini oasis in south of tunisia, were analysed using both univriate and multivariete analysis applied to a set of 33 quantitative and qualitative traits. Results of Duncan test (α=0.05) and coefficient of variance analysis reflected significant differences between cultivars for head weight, head diameter, leaf and seed color. The color of leaves ranges from yellow to darck green with different degrees of shininess. Leaf margin are lobed for CV 2, CV 4, CV 7, CV 8 and entiers for the others cultivars. Seed colour varies including white for cultivars (CV 1, CV 2, CV 4, CV 5), black for (CV 6, CV 7, CV 8) and grey for CV 3.

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Quantitative trait loci associated with tipburn, heat stress-induced physiological disorders, and maturity traits in crisphead lettuce

2013

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Crisphead lettuce (Lactuca sativa L.) crops exhibit several economically important, physiological disorders when grown in high temperature conditions. These include tipburn, rib discoloration, premature bolting, ribbiness, and internal rib cracking. We evaluated seven physiological disorders and three agronomic traits segregating in a recombinant inbred line (RIL) population consisting of 152 F RILs derived from an intra-specific cross between two crisphead cultivars, L. sativa cv. Emperor x L. sativa cv. El Dorado; evaluations were carried out at each of two parental maturities in one planting and at one intermediate maturity in a second planting in each of 2 years for a total of six evaluations. A genetic map was developed using 449 polymorphic SNP markers; it comprises 807 cM in 20 linkage groups that covered 51 % of the nine lettuce chromosomes. Composite interval mapping revealed a total of 36 significant QTLs for eight out of the ten traits evaluated. Significant QTLs were distributed in 11 linkage groups on seven of the chromosomes and accounted for up to 83 % of the phenotypic variation observed. The three largest QTLs for rib discoloration, which accounted individually for 7-21 % of the variation, were clustered with stem length, two with ribbiness and one with head firmness. Three major clusters of QTLs revealed pleiotropic effects or tight linkage between tipburn incidence and severity, head type, stem length, head firmness and ribbiness. One QTL, qTPB5.2, was detected in multiple trials and described 38-70 % of the variation in tipburn incidence. qTPB5.2 is, therefore, a useful candidate gene for breeding for tipburn resistance using marker-assisted selection.

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Rib Discoloration in F2 Populations of Crisphead Lettuce in Relation to Head Maturity

Cited by 4 publications

References 17 publications

Genotype by environment interactions of heat stress disorder resistance in crisphead lettuce

Genotype by environment interactions of heat stress disorder resistance in crisphead lettuce

Morphological characterization of cultivars collection of Lettuce (Lactuca sativa L.) from Tunisian oasis

Quantitative trait loci associated with tipburn, heat stress-induced physiological disorders, and maturity traits in crisphead lettuce

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