Lausser, Andreas and Kliwer, Irina and Srilunchang, Kanok-orn and Dresselhaus, Thomas (2010) Sporophytic control of pollen tube growth and guidance in maize. JOURNAL OF EXPERIMENTAL BOTANY, 61 (3). pp. 673-682. ISSN 0022-0957, 1460-2431
Full text not available from this repository. (Request a copy)Abstract
Pollen tube germination, growth, and guidance (progamic phase) culminating in sperm discharge is a multi-stage process including complex interactions between the male gametophyte as well as sporophytic tissues and the female gametophyte (embryo sac), respectively. Inter- and intra-specific crossing barriers in maize and Tripsacum have been studied and a precise description of progamic pollen tube development in maize is reported here. It was found that pollen germination and initial tube growth are rather unspecific, but an early, first crossing barrier was detected before arrival at the transmitting tract. Pollination of maize silks with Tripsacum pollen and incompatible pollination of Ga1s/Ga1s-maize silks with ga1-maize pollen revealed another two incompatibility barriers, namely transmitting tract mistargeting and insufficient growth support. Attraction and growth support by the transmitting tract seem to play key roles for progamic pollen tube growth. After leaving transmitting tracts, pollen tubes have to navigate across the ovule in the ovular cavity. Pollination of an embryo sac-less maize RNAi-line allowed the role of the female gametophyte for pollen tube guidance to be determined in maize. It was found that female gametophyte controlled guidance is restricted to a small region around the micropyle, approximately 50-100 mu m in diameter. This area is comparable to the area of influence of previously described ZmEA1-based short-range female gametophyte signalling. In conclusion, the progamic phase is almost completely under sporophytic control in maize.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ZEA-MAYS-L; SELF-INCOMPATIBILITY; STIGMA INTERACTION; GRASSES; PISTIL; REJECTION; BARRIERS; FEMALE; Female gametophyte; maize; pollen tube guidance; prezygotic barriers; transmitting tract; Tripsacum |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Lehrstuhl für Zellbiologie und Pflanzenphysiologie (Prof. Dr. Klaus Grasser) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Aug 2020 09:10 |
| Last Modified: | 05 Aug 2020 09:10 |
| URI: | https://pred.uni-regensburg.de/id/eprint/25087 |
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