Natural cross-pollination in roselle, Hibiscus sabdariffa L. (Malvaceae)

Abstract

Two local varieties of roselle (Hibiscus sabdariffa L.), Jamaican Green and Jamaican Red, were grown to determine the amount of natural cross-pollination. Two planting arrangements (alternating rows; alternating individuals in a row) and two planting dates, a month apart, were used for the outcrossing experiments. Stem pigmentation, red (R-) vs. green (rr), was used as a genetic marker in the estimation of outcrossing. Homozygous dominant and recessive genotypes of Jamaican Red and Jamaican Green, respectively, were grown in both of the planting arrangements and dates. Seeds from open-pollinated capsules of randomly selected Jamaican Green plants were planted to score the frequency of cross-pollination. Estimates of natural cross-pollination ranged from 0.20 ± 0.09% to 0.68 ± 0.34%. Roselle outcrosses at a low rate in Jamaica.

Crossability Studies among Twenty Accessions of Roselle (Hibiscus sabdariffa L.)

“…These findings are in consonance with observations of Vaidya (2000), who also found low crossability rates during a natural hybridisation studies in Hibiscus sabdariffa var Sabdariffa. These outcomes denote that only partial pair-wise design (Todd, 2013) may be possible for intra-varietal crosses involving accessions of Hibiscus sabdariffa var Sabdariffa.…”

“…Moreover, pollen viability and stigma receptivity are known to peak in the period immediately after opening of flowers (6 am-7 am) resultant of cleistogamous mode of pollination of roselle (Vaidya, 2000). Thus, crosses made in early hours of the day are more likely to be successful than those conducted later then.…”

“…However, a previous hybridisation study suggests possible crossability barrier among genotypes of roselle (Vaidya, 2000). A study of crossability is therefore crucial to provide relevant information on compatibility and fertility status of the various varieties of roselle cultivated in Ghana as potential sources of breeding materials for improvement of the crop.…”

Heterosis And Combining Ability Estimates In 6x6 Half-Diallele Cross Of Roselle (Hibiscus Sabdariffa L.)

“…Vaidya (2000) studied the natural out cross-pollination in roselle. Sanyal and Dutte (1984) found genetic variability in flowering date and calyx yield in two cultivars of roselle.…”

Diversity analysis based on agro-morphological traits and microsatellite based markers in global germplasm collections of roselle (Hibiscus sabdariffa L.)

“…Roselle (Hibiscus sabdariffa L.) is a self-pollinated (Vaidya, 2000) dicot plant (Malvaceae) cultivated across tropical and subtropical countries for myriads of uses (Akpan, 2000;Mostafa et al, 2005). Depending upon geographical region the species acquired various vernacular names viz., Roselle, Sorrel, Jamaica sorrel, Indian sorrel, Queensland Jelly plant, Jelly okra, Florida cranberry, Karkade, Bisap, Lal ambadi, Patwa (Morton, 1974;Gautam, 2004).…”