The morphology and anatomy of the haustoria of the holoparasitic angiosperm cuscuta campestris | [Pakistan Journal of Botany • 2011]

Author(s):

1. Lan Hong: College of Life Sciences, Guangdong Key Lab of Biotechnology for Plant Development, South China Normal University, Guangzhou 510631, China Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, . Chinese Academy of Sciences, Guangzhou 510650, China

2. Ling Li: College of Life Sciences, Guangdong Key Lab of Biotechnology for Plant Development, South China Normal University, Guangzhou 510631, China

3. Hao Shen: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, hinese Academy of Sciences, Guangzhou 510650, China

4. Hua Chen: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, hinese Academy of Sciences, Guangzhou 510650, China Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

5. Xiaoying Hu: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, hinese Academy of Sciences, Guangzhou 510650, China

6. Xinlan Xu: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, hinese Academy of Sciences, Guangzhou 510650, China

7. Wanhui Ye: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, hinese Academy of Sciences, Guangzhou 510650, China

8. Zhangming Wang: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, hinese Academy of Sciences, Guangzhou 510650, China

Abstract:

The morphology and anatomy of the haustoria of the holoparasitic angiosperm Cuscuta campestris parasitizing itself and different tissues of Mikania micrantha were studied under scanning electron microscope, confocal laser scanning electron microscope and light microscope. C. campestris has a low stomatal density on the stem and there is a nonfunctional conical protuberance with a unique elliptic pore at the apex, which has not been reported before and we call it pseudo-haustorium. The pseudo-haustorium originates from the cortical parenchyma just external to the pericycle. Its initial cells divide anticlinally and periclinally, and then develop into an endophyte primordium, which consists of file cells and meristematic cells. When C. campestris infects host stem, petiole, leaf lamina and itself, it prefers host stem and has the least choice for leaf lamina. The development of the haustoria invading different tissues reveals that the haustorium in the leaf lamina region without veins is initially flat and its search hyphae does not differentiate into xylem and phloem hyphae, which differs from the haustoria with the annular vessel and phloem hyphae in host stem, petiole and its own stem. These indicate that the haustoria might differentiate vascular tissues only when their search hyphae come in with the contact the vascular tissues of the host or itself.

Page(s): 1853-1859

DOI: DOI not available

Published: Journal: Pakistan Journal of Botany, Volume: 43, Issue: 4, Year: 2011

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