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Identification of morphometric traits for screening of tejocote (Crateagus spp.) germplasm for better yield potential

Published online by Cambridge University Press:  23 January 2009

Carlos A. Núñez-Colín ,
Jaime Sahagún-Castellanos ,
Fernando González-Andrés ,
Alejandro F. Barrientos-Priego ,
Sergio Segura  and
Raúl Nieto-Ángel
Carlos A. Núñez-Colín
Affiliation:
Campo Exp. Baijo, Inst. Nac. Investig. For., Agric. Pecu., km 6.5, Carret. Celaya-San Miguel de Allende, Celaya, Guanajuato, 38110 Mexico
Jaime Sahagún-Castellanos
Affiliation:
Inst. Hortic., Dep. Fitotec., Univ. Autón. Chapingo, km. 38.5, Carret. México-Texcoco, Chapingo, 56230, State Mex., Mexico
Fernando González-Andrés
Affiliation:
Dep. Ing. Cienc. Agrar., EST Ing. Agrar., Univ. León, Ave. Portugal 41, León, 24071, Castilla y León, Spain
Alejandro F. Barrientos-Priego
Affiliation:
Inst. Hortic., Dep. Fitotec., Univ. Autón. Chapingo, km. 38.5, Carret. México-Texcoco, Chapingo, 56230, State Mex., Mexico
Sergio Segura
Affiliation:
Cent. Reg. Univ. Cent. Occidente, Univ. Autón. Chapingo, Ave. Perif. Indep. 1000, Morelia, 58170, Michoac., Mexico
Raúl Nieto-Ángel
Affiliation:
Inst. Hortic., Dep. Fitotec., Univ. Autón. Chapingo, km. 38.5, Carret. México-Texcoco, Chapingo, 56230, State Mex., Mexico
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Abstract

Introduction. Tejocote (Crataegus spp.) is an edible fruit species that some Mesoamerican cultures have cultivated since pre-Hispanic times in Mexico; however, this fruit crop has not undergone formal breeding. It is unknown whether morphological markers associated with fruit size exist to be used for indirect selection; this could be important, because this species has a large cycle. Our research aimed at studying phenotypic correlations between leaf and stomata characters with fruit weight; such correlations might be used as morphological markers for selection of superior germplasm for fruit weight. Materials and methods. Pearson’s correlation coefficients of 36 leaf variables and three leaf stomata variables with fruit weight were calculated in 94 genotypes of four different species. Results. As expected, the correlations calculated for each species and for the species pool differed. However, the number of veins in leaves of reproductive shoots was positively correlated with fruit weight (P ≤ 0.05) in the two most important horticultural species. On the other hand, C. mexicana was the best option for selecting superior germplasm, and the most significant variables correlated with fruit weight in this species were leaf major axis length of large vegetative shoots, leaf elongation ratio and number of veins of reproductive shoot leaves. Discussion. These variables could be good selection indices or morphological markers that can be used for early screening of germplasm for yield potential.

Keywords

MexicoCrataegus spp.plant breedingchoice of speciesselection criteriafruitsyieldsMexiqueCrataegus spp.amélioration des planteschoix des espècescritère de sélectionfruitsrendement
Type
Research Article
Information
Fruits , Volume 64 , Issue 1 , January 2009 , pp. 35 - 44
Copyright
© CIRAD, EDP Sciences, 2009

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