scholarly journals Cultivation and ecophysiology of rice plants in the tropics. III. Photosynthesis of rice cultivars of india, measured by the Tsuno's simple method.

1988 ◽  
Vol 57 (1) ◽  
pp. 184-190 ◽  
Author(s):  
Tetsuro TANIYAMA ◽  
S.V. SUBBAIAH ◽  
M.L. N.RAO ◽  
Katsuhiko IKEDA
Keyword(s):  
Rice Cultivars ◽  
Simple Method ◽  
Rice Plants ◽  
The Tropics

scholarly journals Cultivation and ecophysiology of rice plants in the tropics. II. Behaviour of stomatal aperture in some rice cultivars of India.

1987 ◽  
Vol 56 (2) ◽  
pp. 226-231 ◽  
Author(s):  
Tetsuro TANIYAMA ◽  
M. L. N. RAO ◽  
S. V. SUBBAIAH ◽  
Katsuhiko IKEDA
Keyword(s):  
Stomatal Aperture ◽  
Rice Cultivars ◽  
Rice Plants ◽  
The Tropics

Developing Aerobic Rice Cultivars for Water-Short Irrigated and Drought-Prone Rainfed Areas in the Tropics

Crop Science ◽  
2010 ◽  
Vol 50 (6) ◽  
pp. 2268-2276 ◽  
Author(s):  
D. L. Zhao ◽  
G. N. Atlin ◽  
M. Amante ◽  
Ma. Teresa Sta Cruz ◽  
A. Kumar
Keyword(s):  
Aerobic Rice ◽  
Rice Cultivars ◽  
The Tropics

scholarly journals Aspects of cultivar variation in physiological traits related to Cd distribution in rice plants with a short-term stress

2020 ◽  
Author(s):  
Wan-Ting Chiao ◽  
Bo-Ching Chen ◽  
Chien-Hui Syu ◽  
Kai-Wei Juang
Keyword(s):  
Shoot Growth ◽  
Rice Grain ◽  
Rice Cultivars ◽  
Cd Accumulation ◽  
Physiological Regulation ◽  
Rice Plants ◽  
Cd Contamination ◽  
Cultivar Variation ◽  
Cd Distribution ◽  
Cd Translocation

Abstract Background Genotypic variations are seen in cadmium (Cd) tolerance and accumulation in rice plants. Cultivars that show low Cd translocation from the root into shoot can be selected to reduce Cd contamination in rice grains. This study aims to clarify the physiological regulation related to Cd absorption by rice plants for screening out the cultivars, which have relatively low Cd accumulation in grains. Eight Taiwan mega cultivars of paddy rice: japonica (TY3, TK9, TNG71, and KH145 cultivars), indica (TCS10 and TCS17 cultivars), and glutinous (TKW1 and TKW3 cultivars), which are qualified with the criteria for rice grain quality by the Council of Agriculture, Taiwan, were used for illustration. An experiment in hydroponics was conducted for the rice seedlings with a treatment of 50 μM CdCl 2 for 7 days. Results and discussion After the Cd treatment, the reductions in shoot growth were more significant than those in root growth; however, Cd absorbed in the rice plant was sequestered much more in the root. The malondialdehyde (MDA) was preferentially accumulated in rice root but the hydrogen peroxide (H 2 O 2 ) was increased more significantly in the shoot; the antioxidative enzymes, superoxide dismutase (SOD) and ascorbate peroxidase (APX), were pronounced more in rice shoot. Conclusions The rice cultivars preferentially accumulated Cd in the root rather than the shoot with the Cd treatment, which resulted in significant enhancements of MDA and growth reductions in the root. However, H 2 O 2 accumulation was toward the shoot to retard shoot growth suddenly and then the root could keep a gradual growth. Also, the rice cultivars, which preferentially accumulate Cd in the root, would have the regulation tendency of SOD toward the shoot. Due to that SOD is responsible for H 2 O 2 production, H 2 O 2 accumulation would be thus toward the shoot. Moreover, the cultivars, which have a less regulation tendency of APX toward the shoot, would present higher translocation of Cd into the shoot.

scholarly journals Screening of osmotolerant micro organisms in the dried salted fish sold in kanyakumari district, tamilnadu

2020 ◽  
Vol 7 (1) ◽  
pp. 39-49
Author(s):  
Mary Kensa V ◽  
Anju M
Keyword(s):  
Moisture Content ◽  
Pathogenic Bacteria ◽  
Nutritive Value ◽  
Fungal Species ◽  
Human Pathogens ◽  
Simple Method ◽  
Salted Fish ◽  
Fish Samples ◽  
Micro Organisms ◽  
The Tropics

Fish is one of the most important sources of animal protein available in the tropics and has been widely accepted as a good source of protein and other elements for the maintenance of healthy body. Salting and drying is an ancient and simple method to preserve fish and in India about 17% of the total catch is beingused for salting and drying. The present investigation was aimed to analyse the presence of osmotolerant microbes in the dry fishes. The commercially important marine edible salted dry fishes were collected from the study area Pallam. Four common edible dry fishes like (Nethili, Sardines, Ribbon fish and Prawn) wereselected for the screening of microbial population. The highest TFC value was reported in Sardine and Ribbon fish (5103) than the other fishes like Netthili and Prawn (4103 and 2103). The moisture content was higher (45%) in Prawn followed by Ribbon fish (40%), Sardines (29%), Netthili (26%). In this study,Prawn had high moisture content (45%) and high microbial load (5.3104 cfu/g). Total five fungal species were isolated from the selected dried fishes. The result of isolation of human pathogens such as Salmonella and Vibrio identified from the selected dry fish samples. The nutritive value of raw fish in found to be good.The sensory characteristics such as colour, odor, texture, insect infestation showed that the Sardine and Prawn was good in quality, while the netthili had decreased the quality. The study showed that salted and sundried fishes sold in study area are contaminated with pathogenic bacteria and fungal agents. Spoilage ofdried fish products was found and this might be due to unhygienic handling of the fisher folks, improper processing and unhygienic vendors and vending areas.

scholarly journals Remote estimation of leaf area index (LAI) with unmanned aerial vehicle (UAV) imaging for different rice cultivars throughout the entire growing season

2021 ◽  
Author(s):  
Yan Gong ◽  
Kali Yang ◽  
Zhiheng Lin ◽  
Shenghui Fang ◽  
Xianting Wu ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Large Scale ◽  
Growing Season ◽  
Canopy Height ◽  
Dynamic Monitoring ◽  
Estimation Accuracy ◽  
Rice Cultivars ◽  
Simple Method ◽  
Area Index ◽  
Aerial Vehicle

Abstract Background: Rice is one of the most important grain crops worldwide. The accurate and dynamic monitoring of leaf are index (LAI) provides important information to evaluate rice growth and production. Methods: This study explores a simple method to remotely estimate LAI with Unmanned Aerial Vehicle (UAV) imaging for a variety of rice cultivars throughout the entire growing season. 48 different rice cultivars were planted in the study site and field campaigns were conducted once a week. For each campaign, several widely used vegetation indices (VI) were calculated from canopy reflectance obtained by 12-band UAV images, canopy height was derived from UAV RGB images and LAI was destructively measured by plant sampling. Results: The results showed the correlation of VI and LAI in rice throughout the entire growing season was weak, and for all tested indices there existed significant hysteresis of VI vs. LAI relationship between rice pre-heading and post-heading stages. The model based on the product of VI and canopy height could reduce such hysteresis and estimate rice LAI of the whole season with estimation errors under 24%, not requiring algorithm re-parameterization for different phenology stages. Conclusions: The progressing phenology can affect VI vs. LAI relationship in crops, especially for rice having quite different canopy spectra and structure after its panicle exsertion. Thus the models solely using VI to estimate rice LAI are phenology-specific and have high uncertainties for post-heading stages. The model developed in this study combines both remotely sensed canopy height and VI information, considerably improving rice LAI estimation accuracy at both pre- and post-heading stages. This method can be easily and efficiently implemented in UAV platforms for various rice cultivars during the entire growing season with no rice phenology and cultivar pre-knowledge, which has great potential for assisting rice breeding and field management studies at a large scale.

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