Quick Menu

Upcoming Journals

International Journal of Biochemistry Research & Review

International Journal of Biochemistry Research & Review, ISSN: 2231-086X,Vol.: 1, Issue.: 3 (October-December)

 

Original Research Article

 

Biochemical Constituents in Malformed Tissues of Pearl Millet Cultivars Caused by Aggressive Pathotype of Sclerospora graminicola Causing Downy Mildew Disease

 

 

Arun Kumar1*, P. C. Mali1 and B. L. Gajja1

1Central Arid Zone Research Institute, Jodhpur-342003, India.

 

Abstracts

 

Downy mildew (DM) of pearl millet [Pennisetum glaucum (L.) R. Br.] caused by Sclerospora graminicola is the most widespread and destructive disease. In DM affected plants disease symptoms appear suddenly with the emergence of green ear, which exhibits all possible degrees of proliferations and malformation of the panicle. The pathogen population at Jodhpur, India is more virulent among other prevalent pathotypes as highly resistant pearl millet lines turned susceptible at this location. Virulence of pathotype rapidly changes host physiology producing varied symptoms in leaves and ear heads. Biochemical components including carbohydrates, phenols, free proline, photosynthetic pigments and enzymes like polyphenol oxidase (PPO), peroxidase (POX), IAA oxidase (IAAO) and catalase were found considerably deranged in malformed tissues. Results indicated that in two highly susceptible cultivars (Nokha local and Eknath) high soluble sugars were recorded in DM necrotic/chlorotic leaves and malformed ear heads, whereas starch contents were reduced in infected ear heads. Total and O-dihydroxy phenols were higher in DM infected leaves as well as in the malformed ear heads. Free proline contents were increased manifold in DM infected leaves and in proliferated panicles. Total chlorophyll contents reduced drastically in DM infected leaves. In ear heads showing tufting and complete malformation, total chlorophyll and carotenoids were low when compared to healthy and diseased leaves. Activities of PPO, POX, IAAO and catalase were higher in DM affected leaves and suppressed and completely malformed ear heads in comparison to their healthy counterparts. The study suggests that accumulation of total phenols caused the hyperphenolicity in infected host tissues despite increased activities of POX, PPO, catalase and IAA oxidase.

 

Keywords :

Pearl millet; downy mildew; Sclerospora graminicola; new aggressive pathotype; biochemical analysis;

 

 

DOI : 10.9734/IJBCRR/2011/496

Review History    Comments


Search this site

Advanced Search

Announcement & News

SDI SITE: 4.55 million page views, 1.14 million sessions, 705546 visitors

We thank all scientists and researchers all over the world for visiting and using SDI site.   ...

SCIENCEDOMAIN international received 5844 submissions in 2013

SCIENCEDOMAIN international is pleased to announce that it has received 5844 submissions in 2013, ac...

Science (IF: 31) report confirmed the high standard of SDI journal

As per a recent report (Link) of Science journal (present Impact factor 31), one of our journal (Bri...

Polish Ministry of Science and Higher Education included 18 SDI journals in its official report of 2013

SDI is pleased to announce that Polish Ministry of Science and Higher Education included 18 SDI jour...

SDI introduced Post-publication peer review by its comment section

SDI journals encourage Post-publication peer review by its comment section   Policy details a...

SDI promotes transparent Advanced OPEN peer review

We have migrated to transparent and toughest ‘Advanced OPEN peer review’ system (Detaile...

SCIENCEDOMAIN international received over 5000 submissions in 2013 (till 25th November, 2013)

SCIENCEDOMAIN international is pleased to announce that it has received over 5000 submissions in 201...



SCIENCEDOMAIN Awards

Browser Compatibility : Mozila firefox, Google Crome and IE 7 & above. Creative Commons License Terms & Condition  |  Privacy Policy  |  Join Us  |  Help  |  Contact Us
© Copyright 2010-2014, SCIENCEDOMAIN international. All rights reserved.