scholarly journals Nucleolar variation in a pigeon pea intergeneric hybrid: evidence for allosyndetic recombination

1984 ◽  
Vol 26 (5) ◽  
pp. 499-505 ◽  
Author(s):  
P. Sateesh Kumar ◽  
N. C. Subrahmanyam ◽  
D. G. Faris
Keyword(s):  
Cajanus Cajan ◽  
Size Variation ◽  
Nucleolar Organizer ◽  
Intergeneric Hybrid ◽  
Pigeon Pea ◽  
Pollen Sterility ◽  
Nucleolar Dominance ◽  
Structural Heterozygosity ◽  
Nucleolar Number ◽  
Mother Cells

Cytological study of a hybrid between Cajanus cajan and Atylosia albicans revealed regular bivalent formation and disjunction. Nevertheless, high pollen sterility and low seed set were evident. An examination of pollen mother cells revealed variation in nucleolar number at telophase-I (four to eight) and at telophase-II (zero to four in daughter nuclei), although each genome contained two nucleolar organizers. Variation was also recorded for nucleolar size and distribution at telophase-II. Variation in nucleolar number and distribution are interpreted to have originated from pairing and recombination between nucleolar organizer chromosome(s) of one parental species with the nonnucleolar organizer chromosome(s) of the other. Size variation is attributed to nucleolar dominance. These results explain the high degree of pollen sterility in the hybrid in spite of normal meiosis, and also suggest that the karyotypes of C. cajan and A. albicans have differentiated through structural heterozygosity.Key words: Cajanus cajan, Atylosia albicans, nucleolar variation, structural heterozygosity, allosyndetic recombination.

scholarly journals Using AFLP-RGA markers to assess genetic diversity among pigeon pea (Cajanus cajan) genotypes in relation to major diseases

2014 ◽  
Vol 28 (2) ◽  
pp. 198-205 ◽  
Author(s):  
Prakash G Pati ◽  
Subhojit Datta ◽  
Ikechukwu O Agbagwa ◽  
Indra Prakash Singh ◽  
Khela Ram Soren ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Cajanus Cajan ◽  
Pigeon Pea

Performance of pigeon pea (Cajanus Cajan l.) based intercropping system with millets under Northern Dry Zone of Karnataka

2020 ◽  
Vol 9 (1) ◽  
pp. 277-281
Author(s):  
S A Biradar ◽  
Vivek S Devarnavadagi ◽  
Shivalingappa Hotkar ◽  
B C Kolhar ◽  
S C Rathod
Keyword(s):  
Cajanus Cajan ◽  
Pigeon Pea ◽  
Dry Zone

scholarly journals Size variation in the vascular cambium and its derivatives in two Alstonia species

2007 ◽  
Vol 21 (3) ◽  
pp. 531-538 ◽  
Author(s):  
Moin A. Khan ◽  
Badruzzaman Siddiqui
Keyword(s):  
Size Variation ◽  
Tropical Tree Species ◽  
Edaphic Conditions ◽  
Appreciable Increase ◽  
Ray Cells ◽  
Fusiform Initials ◽  
Xylem Ray Cells ◽  
Mother Cells ◽  
Xylem Fibers ◽  
Fusiform Initial

Two tropical tree species viz. Alstonia venenata Br. and Alstonia neriifolia Don. (Apocynaceae) were investigated to detect size variation in different elements of the cambium and its derivative tissues. Although these two species were grown under identical climatic and edaphic conditions, fusiform initial dimensions and the elements derived from them were larger in A. venenata than in A. neriifolia. Ray initials are rectangular in A. venenata but isodiametric in A. neriifolia. An appreciable increase in length was observed in the phloem and xylem ray cells when compared to the mother cells. Maximum elongation was observed in xylem fibers during differentiation from the respective fusiform initials.

scholarly journals Attraction of Neomegalotomus parvus (Westwood)(Heteroptera: alydidae) to cow urine and ammonia

2010 ◽  
Vol 67 (1) ◽  
pp. 84-86 ◽  
Author(s):  
Jovenil José da Silva ◽  
Iara Cintra de Arruda-Gatti ◽  
Adriana Yatie Mikami ◽  
Aline Pissinati ◽  
Antônio Ricardo Panizzi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Cajanus Cajan ◽  
Tap Water ◽  
Pigeon Pea ◽  
Field Trials ◽  
Nacl Solution ◽  
Cow Urine

The alydid bug parvus (Westwood) is not easily detected in the field and the discovery of attractants may be a suitable way to monitor this species. The attraction of N. parvus to traps (transparent, transparent green and yellow) baited with cow urine and ammonia was studied in two field trials. Traps were placed near a terrace with pigeon pea plants (Cajanus cajan L.). Tap water, NaCl 10% aqueous solution (w/v), cow urine, and ammonia (NH4OH 1% aqueous solution) were tested as attractants in yellow, transparent and transparent green traps. Green traps baited with cow urine caught more bugs than yellow and transparent traps (3.2 and 7.2 times more, respectively), and more bugs than traps of the same color with just water (no captures) or NH4OH solution (14.5 times more). Traps baited with ammonia caught more bugs than traps with water: 14.4, 4.7 and 6.7 times more than transparent green, yellow, and transparent traps, respectively, or NaCl solution: 3.9, 7.6 and 6.2 times, respectively. Both ammonia and cow urine are attractive to N. parvus and may be tested to monitor the bugs in the field.

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