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Characterization of resistance to rice leaf folder, Cnaphalocrocis medinalis, in mutant Samba Mahsuri rice lines.

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Title Characterization of resistance to rice leaf folder, Cnaphalocrocis medinalis, in mutant Samba Mahsuri rice lines.
 
Creator Sumalatha Javvaji, Uma Maheswari Telugu, Ramana Damarla Bala Venkata, Maganti Seshu Madhav, Santhosha Rathod, Padmavathi Chintalapati.
 
Subject BPT 5204, Cnaphalocrocis medinalis, Crambidae, folding behavior, leaf folder, leaf width, Lepidoptera, life table, mutant lines, phenotype, rice, silica
 
Description Not Available
The rice leaf folder, Cnaphalocrocis medinalis Guen ee (Lepidoptera: Crambidae), important foliage
feeding insect in rice, Oryza sativa L. (Poaceae), is widely distributed throughout Asia, causing frequent outbreaks and considerable yield losses. Mutants of the rice strain Samba Mahsuri (MSM) represent unique plant material and are explored here for the first time for resistance to the rice leaf
folder. Stringent rapid field screening for two consecutive seasons led to the identification of 10 lines
as moderately resistant, with low damage area as well as low damage score. Upon assessment of vari ous morphological traits potentially contributing to the resistance, damage area was negatively corre lated with leaf length and positively with leaf width. Among the biochemical traits, leaf nitrogen
content was positively correlated with leaf folder damage whereas silica was negatively correlated.
Oviposition preference by leaf folder adult moths and larval settling preference were low on MSM
139 and MSM 127. We also observed that leaf folder larvae took more time for leaf selection
(3.1 min) and making a primary fold (41.5 min), with more head swings (846) in moderately resistant MSM lines. Similarly, in these lines, leaf folders showed a low intrinsic rate of increase (rm = 0.15
females per female per day), low weekly multiplication rate (2.85), and low net reproductive rate
(R0 = 137.5 females per female per generation) with increased generation time (T = 32.8 days) and
doubling time (4.5 days), indicating their relatively poor population growth potential. Overall, the
moderately resistant mutant lines we identified showed reduced ovipositional preference and larval
settling preference, extended larval developmental period with low survival, reduced primary fold
length, and an increased number of binds and head swings with a low intrinsic rate of the increase resulting in reduced population build-up. These lines possessing a good genetic makeup have a great
potential to be used in breeding programs for the development of leaf folder resistant varieties
 
Date 2022-03-31T06:34:39Z
2022-03-31T06:34:39Z
2021-01-10
 
Type Journal
 
Identifier Sumalatha Javvaji, Uma Maheswari Telugu, Ramana Damarla Bala Venkata, Maganti Seshu Madhav, Santhosha Rathod, Padmavathi Chintalapati. 2021. Characterization of resistance to rice leaf folder, Cnaphalocrocis medinalis, in mutant Samba Mahsuri rice lines. Entomologia Experimentalis et Applicata,02 July 2021, 169(9):859-875
ISSN 0013-8703
http://krishi.icar.gov.in/jspui/handle/123456789/70962
 
Language English
 
Relation Not Available;
 
Publisher Wiley Publications, The Netherlands Entomological Society