|Title:||長粒型秈稻不同苗齡耐寒性反應之研究||Other Titles:||Studies on the Reaction of Long-Grain Indica Rice to Cold Tolerance at Different Seedling Stages||Authors:||楊遜謙
|Issue Date:||1-Jun-1976||Publisher:||農業試驗所||Journal Volume:||25||Journal Issue:||2||Start page/Pages:||85-92||Source:||中華農業研究||Abstract:||
The purpose of this study was screening rice varieties as the same variety at the different seedling stage to cold tolerance, for selecting the tolerant cultivars as breeding materials and also developing a method for cold tolerance screening test.
1. Reaction at different seedling stage to cold tolerance eight varieties of 2, 3, 4, 5 and
6-leaf seedling stage of rice cultivars were tested. The seedlings were grown in 60 cm × 30 cm × 5 cm flat tray, then the seedlings were placed in the cold tank with 10°C water . Although the results revealed that the reaction among the different vaneties was not always correlated, however, it showed that at 5 and 6-leaf seedling stage was more sensitive.
2. Different seedling stage response at different temperature. The varieties tested and the sowing method were similarly as in experiment 1. The temperature was held at 6, 8, 10, 12, and 14 °C, individually. When the seedlings were at 3 and 5-leaf stage they were placed in the different temperature tank. The results showed that the response could be divided into below 10°C and above 12°C. When the temperature below 10°C, the criteria was higher, but above 12°C the criteria was lower about 0.5-1.0. Therefore, the temperature for screening was more reliable at 10 °C.
3. Screening for cold tolerance in rice varieties, 122 varieties introduced from IRRI and 116 newly developed lines of long-grain indica rice from Taiwan were sowing in 60cm × 30cm × 5cm flat tray. At the 3-leaf stage, they were placed in cold tank with
10 °C water. Among the 288 varieties (lines) tested, the reaction of criteria 1 was
12 varieties, 2 was 30 varieties(lines), 3 was 52 varieties (lines), 4 was 137 varieties (lines), and 5 was 52 varieties (lines). On the other hand, among the 116 newly developed lines of long-grain indica rice from Taiwan only 2 lines belonged to criteria
2. It is therefore, the breeding for cold tolerance of long-grain indica rice must be intensified.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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