Role of Aeciospores in Outbreaks of Pea (Pisum sativum) Rust (Uromyces fabae)     

Chanda Kushwaha  Ramesh Chand  Chandra Prakash Srivastava 《European journal of plant pathology / European Foundation for Plant Pathology》2006,115(3):323-330

Aeciospores in Uromyces fabae were found to be repeating spores and play an important role in pea rust outbreaks in the North Eastern Plain Zone (NEPZ) of India. Experiments conducted on pea rust from 2001 to 2004 revealed the dominance of aeciospores at all growth stages of pea in this region. Urediospore production was erratic and was only observed in a few samples of stems and tendrils (5–10%). Inoculation of pea plants either by aeciospores or urediospores resulted in the production of aeciospores. Production of aeciospores was observed at a temperature range of 10–25 °C, with a maximum at 25 ± 2 °C. Among the different growth stages of pea, the pod formation stage was highly susceptible and produced the maximum number (744) of aecidia/leaf at 20–25 °C. Significant effects of growth stages and temperature were also noticed for pustule number. Urediospore production mainly coincided with the senescence of the pea plants. Maximum germination (2%) of aeciospores was observed at 25 °C, whereas maximum urediospore germination (3.5%) was at 15 °C. Temperatures > 15 °C decreased urediospore germination. A relative humidity (RH) of 100% was favourable for aeciospore germination while 98% RH favoured urediospore germination. Typical histo-pathological behaviour of the aeciospores was observed.  相似文献   

Role of Testa, Cotyledons and Embryonic Axis in Seed Dormancy of Groundnut (Arachis hypogaea L.)     

A. Bandyopadhyay  P. C. Nautiyal  T. Radhakrishnan  H. K. Gor 《Journal of Agronomy and Crop Science》1999,182(1):37-41

Experiments were carried out during winter–summer (January–June) season to understand the role of seed testa, cotyledons and embryonic axis in imparting dormancy of some groundnut cultivars belonging to different habit groups. Crop was harvested at four maturity stages; 90, 100, 110 and 121 days after emergence (DAE). After drying the pods in shade for 2 days, the germination of seeds with (GST) and without (GSW) testa in rolled germination towels and seeds, and embryonic axes (GEM) in culture media from individual plants of a cultivar was studied. Seed testa played an important role in imparting dormancy followed by the cotyledons, and embryonic axis. However, the nature of dormancy of embryonic axis appeared to be different from that of the testa and cotyledons. Results suggested that the dormancy in groundnut is regulated mainly by testa (a maternal tissue) in the Spanish type, but by cotyledons, and embryonic axis (both zygotic tissue) as well as testa in Virginia types. Thus the genetic control of seed dormancy in groundnut appears to be quantitative in nature.  相似文献   

Induction of rapid and synchronous germination of urediniospores of Melampsora medusae     

C.S. Prakash  W. A. Heather 《Forest Pathology》1985,15(2):126-128

A method to obtain high (> 95 %) and uniform germination of urediniospores of Melampsora medusae on a niembrano filter is described. Such levels of gormination are essential in electrophorotie and other physiological studios of rust fungi.  相似文献   

Characterization and antimicrobial susceptibility of biofilm-producing Avian Pathogenic Escherichia coli from broiler chickens and their environment in India     

Grakh  Kushal  Mittal  Dinesh  Prakash  Anand  Jindal  Naresh 《Veterinary research communications》2022,46(2):537-548

Veterinary Research Communications - Avian pathogenic Escherichia coli (APEC) is responsible for colibacillosis in poultry. APEC remains a constant problem for the poultry industry, despite the use...  相似文献   

Projecting global and regional outlooks for planted forests under the shared socio-economic pathways     

Korhonen  Jaana  Nepal  Prakash  Prestemon  Jeffrey P.  Cubbage  Frederick W. 《New Forests》2021,52(2):197-216

New Forests - There is rising global interest in growing more trees in order to meet growing population, climate change, and wood energy needs. Using recently published data on planted forests by...  相似文献   

The phenological growth stages of Megacarpaea polyandra Benth. ex Madden: a high valued traditional medicinal plant of the Himalaya     

Singh  A.  Nautiyal  M. C.  Curti  R. N.  Fenu  G. 《Genetic Resources and Crop Evolution》2022,69(1):431-441

Genetic Resources and Crop Evolution - Phenological studies of medicinal plants have been less explored especially for plants confined in the Himalayan region (India). Here we describe detailed...  相似文献   

Development and characterization of microsatellite markers,genetic diversity and population structure analysis in Sapota (Manilkara zapota (L.) P. Royen)     

Sathanandam  Pavithra N.  Patil  Prakash  Rekha  Ajitha  Muthuvel  Iyamperumal  Patel  Amrutlal R.  Boggala  Ramesh B.  Shirol  Adiveppa M.  Ravishankar  Kundapura V. 《Genetic Resources and Crop Evolution》2022,69(8):2787-2801

Genetic Resources and Crop Evolution - Manilkara zapota (L.) P. Royen, a widely adapted and popular tree meant for its appetizing fruits in tropics with no genomic resources like microsatellite...  相似文献   

BOOK REVIEW: Soil Analysis. Edited by S. K. Singh,D. R. Biswas,C. A. Srinivasamurthy,S. P. Datta,G. Jayasree,P. Jha,S. K. Sharma,R. N. Katkar,K. P. Raverkar,A. K. Ghosh,Indian Society of Soil Science,New Delhi,India, 2019, pp. INR1400, ISBN 81-903797-8-X.     

Sabyasachi Majumdar  Laxmanarayanan Muruganantham  Kapudeep Karmakar  Prakash Nagabovanalli Basavarajappa 《European Journal of Soil Science》2022,73(4):e13259

  相似文献   

Phylogenetic studies in Citrus reticulata and related types     

H. C. Dass  G. S. Randhawa  D. Prakash 《Euphytica》1977,26(3):805-810

Summary Sixteen types of mandarins were screened for their leaf flavonoid patterns with the help of cellulose thin-layer chromatography. In general, Tanaka's classification of mandarins into 36 species is untenable, as was already concluded by Swingle (1948), Hodgson (1965) and Singh (1967). It is likely that a fine loose skinned mandarin was first evolved. Later, it hybridized with wild mandarin to give rise to numerous types and forms.Contribution No. 474 of Indian Institute of Horticultural Research, Bangalore-6, India.  相似文献   

A unique introgression from Moricandia arvensis confers male fertility upon two different cytoplasmic male-sterile lines of Brassica juncea     

S. R. Bhat    S. Prakash    P. B. Kirti    V. Dinesh  Kumar V. L. Chopra 《Plant Breeding》2005,124(2):117-120

A Brassica juncea line carrying an introgression from Moricandia arvensis restored male fertility to two cytoplasmic male‐sterile (CMS) B. juncea lines carrying either M. arvensis or Diplotaxis catholica cytoplasm. Genetics of fertility restoration was studied in the F₁, F₂, F₃ and backcross generations of the cross between CMS and fertility‐restorer lines. No male‐sterile plants were found in F1‐F₃ generations of the cross between CMS [M. arvensis] B. juncea and the restorer. However, a 1: 1 segregation for male sterility and fertility was observed when the F1 was pollinated with non‐restorer pollen from a euplasmic line. These results clearly show that restoration is mono‐genic and gametophytic. In CMS lines carrying D. catholica cytoplasm, the restorer conferred male fertility to the F1 and showed 3: 1 and 1: 1 segregations for male fertility and sterility in F₂ and BC1 generations, respectively, indicating a monogenic, sporophytic mode of fertility restoration. The results were also supported by pollen stainability in the F1 which was about 65% in M. arvensis‐based CMS and >90% in D. catholica‐based CMS. The above results are discussed in the light of previous molecular studies which showed association between CMS and atpA in both systems.  相似文献