Transcript Reproductive Biology of Angiosperms ביולוגיית ההתרבות של מכוסי הזרע

Reproductive Biology of Angiosperms
‫ביולוגיית ההתרבות של מכוסי הזרע‬
Prof. Rivka Dulberger
‫פרופ' רבקה דולברגר‬
Britannia room 512, Tel: 03-6409845
e-mail: [email protected]
1. Heteromorphic incompatibility
In heterostylous plants incompatibility is tightly linked with heteromorphic characters of
pollen grains, stigmas, and styles. The aim of my studies is to understand the functional
significance of these characters. It appears that some dimorphic characters play a part in
pollen-stigma recognition. In distylous species examined the incompatibility response
was found to take place at the pollen-stigma interface and it differed in the two morphs.
On the other hand, in distylous Villarsia species, the rejection response was observed to
occur at the same site within the stigma and at the same stage of pollen-tube development
in both morphs. The question asked is whether incompatibility in Villarsia operates
independently of dimorphic characters, as is characteristic of monomorphic
incompatibility systems. To examine the cytological expression of the rejection response
in each morph and to assess the functional significance of floral dimorphisms in these
plants, pollen-tube growth is traced both after intraspecific pollinations and after crosses
between distylous and monomorphic species. In these examinations cytochemical
techniques and light and electron microscopy are used.
2. Changes in the pollen exine after pollinations of Linum species
Recent Publications
Dulberger, R. and R.Ornduff. 2000. Stigma morphology in distylous and non-heterostylous
species
of Villarsia (Menyanthaceae). Plant Systematics and Evolution 225: 171--184.
.
Kurek Isaac, Rivka Dulberger, R., Abdussalam Azem, Batsheva Ben Zvi, Duraialagaraja
Sudhakar, Paul Christou, and Adina Breiman. 2002. Deletion of the C-terminal 138 amino acids
of the wheat FKBP73 abrogates calmodulin binding, dimerization and male fertility in transgenic
rice. Plant Molecular Biology 48: 369-381.