Relationship between Sterility and Seedlessness in Citrus.

Abstract

SummaryThe relationship of female and male sterility, and self-incompatibility to seed content in citrus were investigated using 22 male sterile and fertile cultivars. The male fertile cultivars were grouped into self-compatible and self-incompatible. Positive correlation (r = 0.927**, r2=0.859) existed between the average number of seeds per fruit obtained by hand pollination, which indicated the degree of female fertility, and that yielded by open pollination. This result indicates that the degree of female fertility and sterility can be estimated from seeds derived by open pollination. The difference between the average number of seeds per fruit by hand pollination and that by open pollination was greater in male sterile cultivars and in self-incompatible cultivars than it was in self-compatible cultivars. This indicates that self-incompatibility as well as male sterility is effective on the reduction of seediness. In open pollination, self-compatible cultivars produced very few seedless fruits, whereas male sterile and self-incompatible cultivars produced many seedless fruits.

Murcott seedless: influence of gamma irradiation on citrus production and fruit quality

“…Seedlessness in citrus mandarin cultivars can be induced by many factors, and many seedless citrus cultivars have been originated from the bud mutation of seedy cultivars (Yamamoto et al, 1995;Shen, 1997;Vardi et al, 2008). Great achievements have been made over the past few decades in seedless breeding techniques with fruits such as citrus, grape (Vitis vinifera L.), litchi (Litchi chinensis Sonn.…”

“…and wampee (Clausena lansium Lour.) (Yamamoto et al, 1995;Raza et al, 2003;Ye et al, 2009). Among citrus cultivars, mutation breeding has been used to improve sweet orange (Citrus sinensis (L.) Osb.…”

Temperature stress interferes with male reproductive system development in clementine (Citrus clementina Hort. ex. Tan.)

“…In citrus fruit, the failure of the sexual reproductive process (e.g., male sterility) in parthenocarpic cultivars results in seedless fruits (Yamamoto, Matsumoto, & Yamada, ). In contrast to other fruit crops, male sterility can be considered a benefit to avoid the presence of seeds, which is one of the most important quality traits for fresh citrus fruit consumption.…”

Chemical composition of essential oil from leaves of seeded and seedless Citrus reticulata blanco var. kinnow

“…Therefore, the development of seedless fruit cultivars has become a major goal for fruit breeders around the world and different approaches have been adopted by numerous researchers (Raza et. al., 2003, andYamamoto et. al., 1995) Citrus fruits are used for dessert, juice and jam production as well as they have important economic value for their essential oils (Fisher and Phillips, 2008;Anwar, 2008).…”