scholarly journals High Pollen Sterility and 2n Pollen Grains in an Asynaptic 4x Cytotype (2n=48) of Solanum nigrum L.

CYTOLOGIA ◽  
2012 ◽  
Vol 77 (3) ◽  
pp. 333-342 ◽  
Author(s):  
Vijay Kumar Singhal ◽  
Maninder Kaur ◽  
Himshikha Puneet Kumar ◽  
Raghbir Chand Gupta
1986 ◽  
Vol 28 (4) ◽  
pp. 520-524 ◽  
Author(s):  
S. A. Johnston ◽  
R. W. Ruhde ◽  
M. K. Ehlenfeldt ◽  
R. E. Hanneman Jr.

A mutant has been found in diploid Solanum commersonii (2n = 2x = 24) in which no bivalents are formed during microsporogenesis. This trait, a simply inherited recessive, has been designated sy-2. It conditions high levels of pollen sterility through random chromosome segregation at anaphase I. Only the nucleolar-associated chromosomes appear to segregate non-randomly, possibly due to the fusion of the nucleoli as cells near diakinesis. Branched spindle configurations result in multipolar telophase I arrangements, yielding from one to seven pollen grains at the tetrad stage. Most of the stainable pollen produced appears to be 2n. The 2n pollen formed by this mechanism should bear the exact genotype of the parent, since no crossing-over occurs.Key words: Solanum, potato, 2n gametes, mutants (meiotic), mutants (synaptic).


2014 ◽  
Vol 1 (2) ◽  
pp. 20-23
Author(s):  
O. Ivashchenko ◽  
O. Ivashchenko

Aim. Studying of black nightshade young plants’ response to the induced mechanical stresses. Methods. Researches conducted in small plot fi eld experiments. Results. Change of sensitivity level of Solanum nigrum L. plants depending on phases of their development at the moment of damage of elevated parts has been proven. Owing to loss of the surface capable to photosynthesis, there is an essential decrease in volumes of photosynthesis at plants of weed survived and their possibilities of ontogeny passage. The deep induced dis- stresses reduce biological effi ciency of plants, their ability to accumulate weight and to form seeds and even lead them to death. Conclusions. The defi ned principles of response of weed plants to the induced mechanical dis-stresses are can be used for working out and ecological receptions of crops protection from weeds.


2021 ◽  
Vol 1031 (1) ◽  
pp. 012091
Author(s):  
V T Popova ◽  
M A Stoyanova ◽  
T A Ivanova ◽  
A S Stoyanova ◽  
I Z Dimitrova-Dyulgerova

2021 ◽  
Vol 1879 (2) ◽  
pp. 022003
Author(s):  
Muazaz Azeez Al-Hadeethi ◽  
Ali T Al-Taie ◽  
A. Farman Al-Rawi

2017 ◽  
Vol 24 (10) ◽  
pp. 9681-9689 ◽  
Author(s):  
Liqun Sun ◽  
Xiufeng Cao ◽  
Min Li ◽  
Xu Zhang ◽  
Xinxin Li ◽  
...  

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