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| Analysis on Correlation of Microspore Development Stage and Flower Morphological Characteristics of Tuber Mustard‘Yongzha No.2’ |
| WANG Jie1，MENG Qiufeng1，ZHOU Jieping2，REN Xiliang1，GAO Tianyi1，AN Xuejun1 |
| 1Ningbo Academy of Agricultural Sciences，Ningbo 315040，Zhejiang，China；2People’s Government of Xiaocaoe Town，Yuyao City，Zhejiang Province，Yuyao 315475，Zhejiang，China |
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Abstract This study conducted cytological observation on anther and microspore at different developmental stages of tuber mustard‘Yongzha No.2’to definition cellular structure characteristics of microspores at each development stage；observed and measured the flower organ morphological index of microspore at different development stages；and analyzed the correlation between microspore development stage with flower organ morphology．Results showed that‘Yongzha No.2’microspore formation had experienced pollen mother cell，tetrad，early- or mid-uninucleate，late-uninucleate，binucleate and trinucleate（mature pollen）stages．Each stage had its own feature and certain correlation with flower organ external morphological index．The color characteristics of anther and petal were obvious in late-uninucleate stage and binuclear period．While，the petals at binucleate stage were longer than anthers．Therefor，the late-uninucleate stage of‘Yongzha No.2’microspore development could be easily distinguished by naked eye．There were significant differences in vertical and horizontal diameters of flower bud at each microspore development stages．Measuring vertical diameter of flower bud was simple and convenient．The range of vertical diameter of‘Yongzha No.2’flower bud in late-uninucleate stage was 3.50-3.79 mm，which could be used as standard for further determining the flower buds in late-uninucleate stage．
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Received: 09 April 2022
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