Bolting and Flowering Response of Lactuca georgica, a Wild Lettuce Relative, to Low Temperatures - American Journal of Plant Sciences

AJPS > Vol.11 No.12, December 2020

American Journal of Plant Sciences

Volume 11, Issue 12 (December 2020)

ISSN Print: 2158-2742 ISSN Online: 2158-2750

Google-based Impact Factor: 1.57 Citations

Bolting and Flowering Response of Lactuca georgica, a Wild Lettuce Relative, to Low Temperatures ()

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DOI: 10.4236/ajps.2020.1112150 574 Downloads 1,414 Views Citations

Author(s)

Alex Beharav^1#*, Barbara Hellier^2*

Affiliation(s)

¹Institute of Evolution, University of Haifa, Mt. Carmel, Haifa, Israel.
²USDA-ARS, Plant Germplasm Introduction and Testing Research Unit, Washington State University, Pullman, WA, USA.

ABSTRACT

To learn about the phenological adaptation of Lactuca georgica Grossh., a wild relative of domesticated lettuce, we studied seed sampled accessions obtained from individual plants at 19 locations throughout six regions in Armenia, and from two natural populations in Dagestan (Russian Federation) collected as bulk samples. The effects of various vernalization treatments on time to bolting, flowering and seed production time were investigated during four successive years at different growth stages of L. georgica plants. We demonstrate that low temperatures play a major role in stimulating the reproduction process of L. georgica plants. Our results would suggest that for L. georgica: 1) There is an obligatory (or nearly so) vernalization requirement; 2) Plant age, vernalization duration, and genotype of original sample have a role in bolting and flowering regulation; 3) Some plants behaved as typical annuals, responding to vernalization treatment at the seedling stage, but, most did not; 4) Four months of vernalization could be adequate to reach bolting in plants with a developed vegetative rosette, for most—but not all—samples; 5) In order to find the best solution for stimulating the reproductive process of multiple genotypes, it seems that further study should focus on about 4 - 6 months of vernalization at 4°C applied to plants of about 10 - 22 months old vegetative rosettes, with controlled post-vernalization condition; 6) L. georgica germplasm could be used as a source for delayed bolting in breeding of domesticated lettuce varieties.

KEYWORDS

Gene Pools, Lactuca sativa, Phenological Adaptation, Plant Age, Vernalization Duration, Wild Lettuce

Share and Cite:

Beharav, A. and Hellier, B. (2020) Bolting and Flowering Response of Lactuca georgica, a Wild Lettuce Relative, to Low Temperatures. American Journal of Plant Sciences, 11, 2139-2154. doi: 10.4236/ajps.2020.1112150.

Cited by

[1]	Genome-wide screening and characterization of long noncoding RNAs involved in flowering/bolting of Lactuca sativa
	BMC plant biology, 2023

[2]	New insights gained from collections of wild Lactuca relatives in the gene bank of the Institute of Evolution, University of Haifa
	Israel Journal of Plant …, 2023

[3]	Lactuca georgica Grossh. is a wild species belonging to the secondary lettuce gene pool: additional evidence, obtained by KASP genotyping
	Genetic Resources and Crop Evolution, 2022

[4]	Lactuca georgica is a wild species belonging to the secondary lettuce gene pool: additional evidence, obtained by KASP genotyping
	2022

[5]	Lactuca georgica, a new wild source of resistance to downy mildew: comparative study to other wild lettuce relatives
	2021

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