Breeding for Saline-resistant Varieties of Rice : II. Comparative Performance of Some Rice Varieties to Salinity During Early Development Stages

1974 ◽  
Vol 24 (4) ◽  
pp. 176-181 ◽  
Author(s):  
AKBAR Muhammad ◽  
Tomosaburo YABUNO
Keyword(s):  
Early Development ◽  
Rice Varieties ◽  
Comparative Performance ◽  
Development Stages ◽  
Resistant Varieties

scholarly journals Detection of Yeast-like Symbionts in Brown Planthopper Reared on Different Resistant Rice Varieties Combining DGGE and Absolute Quantitative Real-Time PCR

Insects ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 85
Author(s):  
Chengling Lai ◽  
Yun Hou ◽  
Peiying Hao ◽  
Kun Pang ◽  
Xiaoping Yu
Keyword(s):  
Real Time ◽  
Real Time Pcr ◽  
Brown Planthopper ◽  
Nilaparvata Lugens ◽  
Quantitative Real Time Pcr ◽  
Nymphal Instar ◽  
Rice Varieties ◽  
Development Stages ◽  
The Third ◽  
Minimum Number

The brown planthopper (BPH), Nilaparvata lugens, is a serious pest of rice throughout Asia. Yeast-like symbionts (YLS) are endosymbionts closely linked with the development of BPH and the adapted mechanism of BPH virulence to resistant plants. In this study, we used semi-quantitative DGGE and absolute quantitative real-time PCR (qPCR) to quantify the number of the three YLS strains (Ascomycetes symbionts, Pichia-like symbionts, and Candida-like symbionts) that typically infect BPH in the nymphal stages and in newly emerged female adults. The quantities of each of the three YLS assessed increased in tandem with the developing nymphal instar stages, peaking at the fourth instar stage, and then declined significantly at the fifth instar stage. However, the amount of YLS present recovered sharply within the emerging adult females. Additionally, we estimated the quantities of YLS for up to eight generations after their inoculation onto resistant cultivars (Mudgo, ASD7, and RH) to reassociate the dynamics of YLS with the fitness of BPH. The minimum number of each YLS was detected in the second generation and gradually increased from the third generation with regard to resistant rice varieties. In addition, the Ascomycetes symbionts of YLS were found to be the most abundant of the three YLS strains tested for all of the development stages of BPH.

Comparative Performance of Lowland Hybrids and Inbred Rice Varieties in Nigeria

2011 ◽  
Vol 5 (3) ◽  
pp. 224-234 ◽  
Author(s):  
M.G. Akinwale ◽  
G. Gregorio ◽  
F. Nwilene ◽  
B.O. Akinyele ◽  
S.A. Ogunbayo ◽  
...  
Keyword(s):  
Rice Varieties ◽  
Comparative Performance

scholarly journals Vegetated Habitats Trophically Support Early Development Stages of a Marine Migrant Fish in a Coastal Lagoon

2020 ◽  
Vol 43 (2) ◽  
pp. 424-437
Author(s):  
Cristina Andolina ◽  
Piero Franzoi ◽  
Andrew Lloyd Jackson ◽  
Antonio Mazzola ◽  
Salvatrice Vizzini
Keyword(s):  
Early Development ◽  
Coastal Lagoon ◽  
Development Stages

Emerging, Transformative Technologies: Promises and Business Model Challenges

2020 ◽  
Vol 25 (4) ◽  
Author(s):  
Arthur Boni ◽  
Dennis M. Gross
Keyword(s):  
Early Development ◽  
Business Model ◽  
Business Models ◽  
Development Stages ◽  
Healthcare Market ◽  
Development And Validation

This issue provides a perspective on emerging, transformative technologies that promise to create innovations that are intended to provide solutions for significant problems in the biopharma and broader healthcare market.  Many of these technologies have been evolving over the years, but remain in their early development stages technologically. As with most transformative innovations, they come with a host of lengthy and expensive challenges associated with development and validation. And, implementation of transformative business models that are at least as challenging as commercializing the technologies themselves.

scholarly journals Molecular Detections and Resistance Response of Six Rice Varieties to Tungroviruses from South Sulawesi

2020 ◽  
Vol 24 (1) ◽  
pp. 89
Author(s):  
Saipul Abbas ◽  
Sri Sulandari ◽  
Sedyo Hartono ◽  
Y. Andi Trisyono
Keyword(s):  
Sequence Analysis ◽  
Plant Resistance ◽  
Molecular Detection ◽  
The Philippines ◽  
Rice Varieties ◽  
Resistance Response ◽  
South Sulawesi ◽  
Resistant Varieties ◽  
Moderately Resistant ◽  
Infected Sample

The suspected rice virus is found in the field, namely the tungrovirus which is transmitted by green leafhoppers (Nephotettix virescens). The study aimed to detect the tungrovirus molecularly and examine the resistance response of six rice varieties from the transmission of tungrovirus samples from South Sulawesi on a greenhouse scale. Based on the results of molecular detection with RTSV PCR of the double infected sample with DNA bands 1115 bp and RTBV of around 430 bp, Sidrap, and Maros samples were infected by 430 bp size RTBV, while Wajo sample was not detected by both viruses. The results of RTBV sequence analysis showed that the grouping of Sidrap was still one group with Maros and Pinrang samples and different from the group of samples from Malaysia, Thailand, and Philippines. While the grouping of RTSV shows that Pinrang samples are still one group with samples from Bali, Subang, and different from those of the Philippines, India, and Malaysia. The results of transmission in the greenhouse on six rice varieties (TN1, Ciherang, Mekongga, Tukad Unda, Inpari 36, Inpari 37) showed different plant resistance responses such as susceptible, moderately resistant, and resistant reactions based on the amount of disease intensity caused. Varieties that are classified as susceptible are TN1 and Ciherang varieties, moderately resistant, namely Mekongga and Tukad Unda varieties, and resistant varieties namely Inpari 36 and Inpari 37 varieties.

scholarly journals PATHOTYPE PROFILE OF Xanthomonas oryzae pv. oryzae ISOLATES FROM THE RICE ECOSYSTEM IN JAVA

2016 ◽  
Vol 5 (2) ◽  
pp. 63 ◽  
Author(s):  
Suparyono Suparyono ◽  
Sudir Sudir ◽  
Suprihanto Suprihanto
Keyword(s):  
Disease Severity ◽  
Rice Production ◽  
Xanthomonas Oryzae ◽  
Bacterial Leaf Blight ◽  
Bacterial Disease ◽  
West Java ◽  
Rice Varieties ◽  
Central Java ◽  
Resistant Varieties ◽  
Rice Ecosystem

At present, bacterial leaf blight of rice caused by Xanthomonas oryzae pv. oryzae is highly damaging to rice production in Indonesia as most of the existing commercial rice varieties are susceptible to the existing  pathotypes of the bacteria. To solve  such problems, varietal rotation should be based on information on the existence and dominance of local pathotypes in a particular rice ecosystem. To obtain this information, a total of 117 isolates of X. oryzae pv. oryzae, collected from West Java, Central Java, and Yogyakarta, were evaluated for their pathotype variation on five differential rice varieties during the dry season of 2000. When disease severity was < 10%, the reaction was classified as resistant (R) and when > 11%, was susceptible (S). The data indicated that 3.42% of the isolates were pathotype III, 12.82% were pathotype IV, and 83.76% were pathotype VIII. In West Java, the bacterial pathotypes III, IV, and VIII were 4.94%, 14.81%, and 80.25%, respectively. In low elevation areas, 4.94%, 9.88%, and 45.68% were pathotypes III, IV, and VIII, respectively and in medium areas, 4.94% were pathotypes IV and 34.57% were pathotype VIII. In Central Java, no pathotype III was found, while pathotypes IV and VIII were as much as 4.52% and 90.48%, respectively. In low elevation areas, no pathotypes III was recovered, and a total of 9.53% and 76.19% were identified as pathotypes IV and VIII, respectively, and in medium areas only pathotype VIII (14.29%) was identified. In Yogyakarta, pathotypes IV and VIII were found. In low elevation areas, 6.67% and 93.33% were pathotypes IV and VIII, respectively and in medium areas, 14.29% and 85.71% were pathotypes IV and VIII, respectively. The data indicated that variation in pathotype composition over different locations was obvious and locally specific resistant varieties to the disease are needed in the management of this important bacterial disease in rice.

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