Advances in Genetic Study of Cultivar Resistance of Psidium spp. Meloidogyne spp. in a tropical dry forest

被引:0
作者
Molero, T. [1 ]
Molina, J. [2 ]
Casassa-Padron, A. M. [3 ]
机构
[1] Univ Zulia, Fac Humanidades & Educ, Maracaibo 4011, Estado Zulia, Venezuela
[2] Univ Zulia, Fac Expt Ciencias, Maracaibo 4011, Estado Zulia, Venezuela
[3] Univ Zulia, Fac Agronomia, Maracaibo 4011, Estado Zulia, Venezuela
来源
II INTERNATIONAL SYMPOSIUM ON GUAVA AND OTHER MYRTACEAE | 2010年 / 849卷
关键词
P. gua[!text type='java']java[!/text; P; friedrichsthalianum; Meloidogyne mayaguensis; M; incognita; morphology; chromosomes; mitosis;
D O I
暂无
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
In order to study the genetic resistance of Psidium spp. cultivars to nematodes of the genus Meloidogyne, the chromosomal, cytological and morphological constitution of guava trees in a tropical dry forest located in the area of the Centro Fruticola Zulia State-CORPOZULIA (10 degrees 49'47 '', 31914 LN, 71 degrees 46'28 '', 44742 LO), Venezuela was determined. Four tolerant cultivars of Psidium guajava were selected ("AGROLUZ-14", "AGROLUZ-42", "AGROLUZ-45"), one susceptible ("Criolla Roja") and one of Psidium friedrichsthalianum ("Cas") resistant to Meloidogyne spp. (M. mayaguensis and M. incognita). The technique of squashing the root tips was used for the cytogenetic study, in which 1050 cells/tree were analyzed determining: mitotic hour, mitotic index (MI), index of phases and caryological constitution. The mitotic hour was observed in roots collected between 6 and 9 a. m., where they registered the greater values of MI. Mitotic index of tolerant selections were more similar to those of P. friedrichsthalianum, than those of the susceptible selection. All P. guajava cultivars presented 2n = 22 chromosomes with a variable length between 2 and 0.6 mu, while P. friedrichsthalianum presented 2n = 44 with a length of 2.5 to 0.6 mu. The caryological formulae found were: 7m+2sm+2ac for the tolerant selections of P. guajava, 8m+1sm+2ac for the selection "Criolla Roja" and 14m+4sm+4ac for the P. friedrichsthalianum karyotype. In the morphological study several aspects of the leaves, flowers, fruits and seeds were considered. The tetraploidy found in P. friedrichsthalianum agrees with the foliar and fruit characteristics of these plants. The obtained data allows developing programs of genetic improvement with a special view to obtain pest-resistant cultivars that produce fruits of excellent quality to supply the national and world marketplace.
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页码:309 / 317
页数:9
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