Abstract Detail

Hybrids and Hybridization

Gu, Cuihua [1], JI, MENGCHENG [1], CHEN, ZHUOMEI [2], SHEN , XIAOTING [1], ZHENG, GANG [1], WANG, JINFENG [2], Liu, Xinhong [2].

Interspecific Cross Compatibility between Lagerstroemia indica and Lagerstroemia stenopetala (Lythraceae).

The genus Lagerstroemia (crape myrtles), which includes about 55 species, mainly occurs in tropical and subtropical Asia, northeast Australia, northern China and Japan. There are about 16 species of Lagerstroemia in China. Among these species, Lagerstroemia indica is the most popular garden plant and there are more than 200 cultivars worldwide. Cross compatibility is necessary for cross-breeding. It enables expanded breeding parents and hence new germplasm resources. Because there usually exist interspecific-hybridization obstacles in Lagerstroemia, many interspecific cultivars are hard to generate. To test the interspecific cross-compatibility, we focused on cross-compatibility betwen L. indica and L. stenopetala. Interspecific cross-compatibility between L. indica and L. stenopetala was studied by comparing fruit production, pollen tube growth, and seed germination after manipulated cross-pollinations. The results showed that in orthogonal cross-pollination wherein L. indica was the female parent, L. indica has the higher fruit production rate. Observation of the pollen tube showed that pollen germination of L. stenopetala was delayed in the pistil of L. indica because of the development of callose embolism during the growth process of pollen tube. Callose response appeared both on stigma papilla cells and in pollen tubes after orthogonal cross-pollination. When L. stenopetala was the female parent in crosses, pollen of L. indica would begin to germinate at 1h after pollination and the whole fertilization finished after 10h. Nevertheless, pollen-tube growth was slower in orthogonal cross. The average seed number in crosses is not significantly different between the alternate female and male parents. The seed-germination rate of L. stenopetala was the lowest among the hybridization combinations which bore fruits. Seed-germination rate was lower when L. stenopetala was the female parent than that when L. indica was the female parent. Taken together, our results indicate that the interspecific compatibility is different between the two interspecific crosses. Research about how to enhance the interspecific compatibility will be continued.

1 - Zhejiang Agriculture and Forestry University, College of Landscape and Architecture, Lin‘an, Hangzhou, ZJ, 311300, CHN
2 - Zhejiang Forestry Academy, Hangzhou, ZJ, 310023, CHN

Keywords:
Lagerstroemia
 interspecific
hybridization 
cross-compatibility.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PHB005
Abstract ID:727
Candidate for Awards:None