Phylogenetic diversity of Mesorhizobium in chickpea.
Crop domestication, in general, has reduced genetic diversity in cultivated gene pool of chickpea (Cicer arietinum) as compared with wild species (C. reticulatum, C. bijugum). To explore impact of domestication on symbiosis, 10 accessions of chickpeas, including 4 accessions of C. arietinum, and 3 accessions of each of C. reticulatum and C. bijugum species, were selected and DNAs were extracted from their nodules. To distinguish chickpea symbiont, preliminary sequences analysis was attempted with 9 genes (16S rRNA, atpD, dnaJ, glnA, gyrB, nifH, nifK, nodD and recA) of which 3 genes (gyrB, nifK and nodD) were selected based on sufficient sequence diversity for further phylogenetic analysis. Phylogenetic analysis and sequence diversity for 3 genes demonstrated that sequences from C. reticulatum were more diverse. Nodule occupancy by dominant symbiont also indicated that C. reticulatum (60 percent) could have more various symbionts than cultivated chickpea (80 percent). The study demonstrated that wild chickpeas (C. reticulatum) could be used for selecting more diverse symbionts in the field conditions and it implies that chickpea domestication affected symbiosis negatively in addition to reducing genetic diversity.
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru 502 324, India.
Dong Hyun
DH
Kim
Mayank
M
Kaashyap
Abhishek
A
Rathore
Roma R
RR
Das
Swathi
S
Parupalli
Hari D
HD
Upadhyaya
S
S
Gopalakrishnan
Pooran M
PM
Gaur
Sarvjeet
S
Singh
Jagmeet
J
Kaur
Mohammad
M
Yasin
Rajeev K
RK
Varshney
D029863:Cicer / Q000235:genetics / Q000382:microbiology*; D018556:Crops, Agricultural / Q000235:genetics / Q000382:microbiology*; D004271:DNA, Fungal / Q000737:chemistry; D014644:Genetic Variation; D059128:Mesorhizobium / Q000235:genetics* / Q000502:physiology; D010802:Phylogeny; D011157:Population Dynamics; D012336:RNA, Ribosomal, 16S / Q000737:chemistry; D017422:Sequence Analysis, DNA; D013559:Symbiosis
D004271:DNA, Fungal; D012336:RNA, Ribosomal, 16S