Marioara Urda _Grebenisan_ rezumat_teza_engleza - USAMV Cluj ...

Marioara GREBENIŞAN Summary of the PhD thesis
Research on the structure of di- and tetraploid red clover seed plants and the influence of meiotic
anomalies on the fertility of autotetraploid forms
2.3. Climatic conditions in which experiments were conducted ……..
2.3.1. Thermal regime ………………………………………….
2.3.2. Rainfall …………………………………………………...
2.3.3. Other weather conditions …………………………………
C H A P T E R I I I
3. Research on the structure of red clover seed plants and the effect on
seed yield ……………………………………………………………..
3.1. Introduction ………………………………………………………
3.2. Materials and methods …………………………………………...
3.3. Results and discussion …………………………………………...
3.3.1. Components of red clover seed yield …………………….
3.3.1.1. Number of flower heads/plant and per s. m ………
3.3.2. The number of flowers/flower head ……………………...
3.3.3. The number of seeds per flower head …………………….
3.3.4. The average percentage of seeds formation ………………
3.3.5. Thousand kernel weight (TKW) ………………………….
3.3.6. The calculated and real seed yield ………………………..
3.3.6.1. Flowering stages and seed yield ………………….
C A P I T O L U L I V
4. Pollination and seed formation process in diploid and tetraploid red clover
(Trifolium pratense L.) for Transylvania conditions ………………………
4.1. Red clover pollination particularities in relation with the number and type
of pollinators ………………………………………………………….
4.1.1. Introduction ………………………………………………
4.1.1.1. Research method …………………………………
4.2. Result and disscutions …………………………………………
4.2.1. Abiotic and biotic factors involved in red clover
pollination ………………………………………………...
4.2.2. Flowering period …………………………………………
4.2.3. Pollinators distribution in seed crops …………………….
4.2.4. Total number of bees and bumble bees …………………..
4.2.5. Daily frequency of bees and bumble bees ………………..
4.2.6. Bees and bumble bees waiting time on red clover flower
heads ………………………………………………………....
4.2.7. Comparative aspects regarding the total number of
“insect-units” and the relative fertility of red clover …….
4.3. Aspects of correlation between weather conditions and pollinators
flight …………………………………………………………….
CHAPTER V
5. The comparative effects of the micro- and macrosporogenesis of the red
clover with different levels of ploidy, in relation with its fertility ………
5.1. The evolution of embryogenesis and its influence on fertility ….
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