Pollen selection for Alternaria resistance in oilseed brassicas: responses of pollen grains and leaves to a toxin of A. brassicae

1993 ◽  
Vol 86-86 (2-3) ◽  
pp. 339-344 ◽  
Author(s):  
K. R. Shivanna ◽  
V. K. Sawhney
Keyword(s):  
Pollen Grains ◽  
Pollen Selection ◽  
Oilseed Brassicas ◽  
Selection For ◽  
Alternaria Resistance

Pollen Selection for Stress Tolerance or the Advantage of Selecting Before Pollination

1988 ◽  
pp. 43-50 ◽  
Author(s):  
D L Mulcahy ◽  
G B Mulcahy ◽  
R Popp ◽  
N Fong ◽  
N Pallais ◽  
...  
Keyword(s):  
Stress Tolerance ◽  
Pollen Selection ◽  
Selection For

Germination Schedules of Pollen Grains: Implications for Pollen Selection

Evolution ◽  
1989 ◽  
Vol 43 (1) ◽  
pp. 220 ◽  
Author(s):  
James D. Thomson
Keyword(s):  
Pollen Grains ◽  
Pollen Selection

Haplo-diploid gene expression and pollen selection for tolerance to acetochlor in maize

1994 ◽  
Vol 88 (6-7) ◽  
pp. 780-784 ◽  
Author(s):  
E. Frascaroli ◽  
S. Galletti ◽  
P. Landi
Keyword(s):  
Gene Expression ◽  
Pollen Selection ◽  
Selection For

Effect of Pollen Selection for Alachlor Tolerance in Maize

Crop Science ◽  
1995 ◽  
Vol 35 (5) ◽  
pp. 1322-1326 ◽  
Author(s):  
E. Frascaroli ◽  
P. Landi ◽  
M. Villa ◽  
M. Sari‐Gorla
Keyword(s):  
Pollen Selection ◽  
Selection For

Sporophytic response to pollen selection for Alachlor tolerance in maize

1994 ◽  
Vol 88 (6-7) ◽  
pp. 812-817 ◽  
Author(s):  
M. Sari-Gorla ◽  
S. Ferrario ◽  
E. Frascaroli ◽  
C. Frova ◽  
P. Landi ◽  
...  
Keyword(s):  
Pollen Selection ◽  
Selection For

INTER-COMPATIBILITY AND PERFORMANCE OF DIPLOID AND DERIVED TETRAPLOID RAPE (BRASSICA CAMPESTRIS L.)

1962 ◽  
Vol 42 (4) ◽  
pp. 672-680 ◽  
Author(s):  
R. K. Downey ◽  
J. M. Armstrong
Keyword(s):  
Seed Oil ◽  
Brassica Campestris ◽  
Early Stage ◽  
Pollen Grains ◽  
2N Pollen ◽  
Seed Oil Content ◽  
Ploidy Levels ◽  
Good Penetration ◽  
Selection For ◽  
And Performance

Normal diploid and derived tetraploid strains of Brassica campestris were grown in alternate 6-row plots at two locations. Rows of tetraploid rape, spaced 18 inches from diploid rows, were distinctly reduced in yield of seed, oil content and seeds per pod, whereas the seed yield of the diploid was not affected by the proximity of the tetraploid. The yield of the tetraploid increased as the distance from the diploid plots increased.Pollen germination studies and controlled crosses were made within and between ploidy levels. Seven and one-half hours after pollination of 2n and 4n stigmas, n pollen had germinated and made good penetration into stylar tissue whereas pollen tubes were just emerging from 2n pollen grains. It was concluded that pollen from diploid plants had a competitive advantage over pollen from tetraploid plants.No evidence of mature triploid seeds was found on tetraploid plants exposed to n pollen or on diploid plants exposed to 2n pollen. It is suggested that if triploid embryos were formed they aborted at an early stage in development.Comparative yield of seed and oil at 13 locations showed that the derived tetraploid strains yielded less than diploid varieties. This was true despite six to eight generations of selection for seed and oil yield, following synthesis of the tetraploid, and although the strains were isolated in groups according to level of ploidy.

Gametic selection during wheat anther culture

Genome ◽  
1989 ◽  
Vol 32 (1) ◽  
pp. 54-56 ◽  
Author(s):  
J. De Buyser ◽  
B. Bachelier ◽  
Y. Henry
Keyword(s):  
Anther Culture ◽  
Selection Pressure ◽  
Pollen Grains ◽  
In Vitro Cultures ◽  
Male Gametes ◽  
Different Types ◽  
Selection For ◽  
Gametic Selection ◽  
Biased Samples

Gametic selection was investigated in a monosomic 1D line of wheat. Comparison of chromosome numbers in progenies from cross- or self-pollination and anther culture indicated the frequency of the different types of gametes acting in zygote formation. The progenies obtained from reciprocal crosses (monosomic × euploid) were different in terms of frequencies of monosomic plants. All the pollen grains do not have an equal probability of fertilization since a strong gametic selection for euhaploid male gametes was observed when the monosomic line was used as male parent; only 13% of the nullisomic survived to embryogenesis and seed germination. Regenerants from anther culture also demonstrated that the percentage of nullihaploids was reduced, indicating a strong selection for euhaploid gametes. A comparison between the frequency of male nullihaploid gametes in the cross disomic × monosomic and in the anther culture revealed that the two processes generate the same gamete transmission. The in vitro cultures do not induce more selection pressure than the embryogenic development even if they are together biased samples of the male gametic population.

Sign in / Sign up

Export Citation Format

Share Document