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Zhuping Fan, Yike Gao, Ling Guo, Ying Cao, Rong Liu, and Qixiang Zhang

, 2000 ). Therefore, systematic scientific research is important to investigate trait inheritance in bearded iris. Heritability evaluation is one of the most fundamental steps in a breeding program to gain access to new genetic changes and to create new

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Ali Akbar Ghasemi Soloklui, Ali Gharaghani, Nnadozie Oraguzie, and Armin Saed-Moucheshi

., 2000 ). Genetic studies on winterhardiness of pomegranate are limited. A review of the literature on temperate fruit crops shows that heritability estimates have been generated for several aspects of freezing tolerance in a few fruit crops (including

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John R. Stommel, Mary J. Camp, Judith M. Dumm, Kathleen G. Haynes, Yaguang Luo, and Anne Marie Schoevaars

attributes are few. This may be attributed to the expertise and resources often required to conduct postharvest assessment of quality attributes. The current report evaluates the heritability of postharvest attributes that contribute to fresh-cut product

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Shuyin Liang, Xuan Wu, and David Byrne

-sense heritability. Heritability is the proportion of variance that is due to genetic components and can be used to determine the appropriate breeding approach. Heritability varies widely for the same trait in the same crop because of statistical designs, different

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Hassan Hajnajari, Bahaeddin Chashnidel, Kourosh Vahdati, Mohsen Ebrahimi, Alireza Nabipour, and Esmaeil Fallahi

traits for progeny selection in the breeding program demands genetic studies to distinguish the environmental and the genetic variances from the phenotypic variances, to calculate the expected genetic contribution in the form of heritability, and to

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Jesse Vorwald and James Nienhuis

successful product, knowledge is needed regarding the heritabilities and genetic relationships among seed and popping characteristics in a temperate-adapted nuña bean population derived from Andean landraces. The objective of this research was to develop a

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Uri Lavi, Emanuel Lahav, Chemda Degani, Shmuel Gazit, and Jossi Hillel

Genetic variance components for avocado (Persea americana Mill.) traits were estimated to improve avocado breeding efficiency. The additive and nonadditive genetic variance components were calculated from the variances between and within crosses. In all nine traits examined, i.e.-anise scent, fruit density, flowering intensity, fruit weight, harvest duration, inflorescence length, seed size, softening time, and tree size-a significant nonadditive genetic variance was detected. Additive genetic variance in all traits was lower and nonsignificant. The existence of major nonadditive variance was indicated also by narrow-sense and broad-sense heritability values estimated for each trait. Therefore, parental selection should not be based solely on cultivar performance. Crosses between parents of medium and perhaps even low performance should also be included in the breeding program.

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Stephen J. Tancred, Aldo G. Zeppa, Mark Cooper, and Joanne K. Stringer

A major objective of the apple (Malus domestica Borkh.) breeding program in Stanthorpe, Australia, is to develop early ripening, high-quality cultivars. The heritability and inheritance of ripening date was investigated. Regression of offspring on midparent harvest dates and estimation of best linear unbiased predictions for parents were used to demonstrate that apple harvest date is highly heritable. Predominantly, additive genetic components of variance are responsible for the variation. Despite the existence of some specific combining ability variance and some non-normal family distributions, the best strategy for a breeder to predict the harvest date of progeny is to calculate the mean harvest date of parents.

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T.E. Thompson and J.F. Baker

Abbreviation: h 2 , heritability. 1 Research Geneticist. 2 Assistant Professor.

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Xuan Wu, Shuyin Liang, and David H. Byrne

its first flush and growth phase during the spring and early-summer months, but also during the second growth phase in mid- to late-summer and fall months. The broad-sense heritability of rose architectural traits has been estimated using a set of