Research on Theories and Techniques of Irrigation for Safeguarding Seed Production of Two-Line Hybrid Rice

Plant Temperature for Sterile Alteration of Rice

“…In the practice of past two decades, techniques commonly used temperatures from thermometer-screen which was located in a 25×25 m 2 green plot and 150 cm height in local weather station (T A ). The sensitive part of rice plant to temperature, however, was in its canopy (Lu et al 2004, 2007, Zou et al 2005. We have noticed that the sterility of rice TGMS lines was affected directly by T p rather than T A .…”

“…II: The sensitive part of rice to the environment condition was lower than the height of screen (Xu et al 1996), which would cause the difference of temperature as well. III: It was confirmed that when TGMS was attacked by lower temperature weather, it was useful of water irrigated to increase field or plant temperature for maintaining its sterility (Lu et al 2004, Xiao et al 1997, Zou et al 2005. However, it is difficult to estimate the increased degree of temperature by such forecasted screen temperature.…”

“…When attacked by lower temperature weather, by irrigating warmer water from river or deep pool, plant temperature would be increased by 2°C, which was effective for safeguarding the sterility of TGMS (Lu et al 2004, Zou et al 2005. So far, the forecast of sterile alteration is only based on the temperature information from weather station; there is lack of any study on field microclimate or plant temperature, and especially no research has focused on the temperature scale of plant or air around it.…”

“…In recent studies, it was found that the fertility alteration of rice TGMS line was sensitive to T p (Lu et al 2007, Xu et al 1996. Lu et al (2004Lu et al ( , 2007 found that the sterility of TGMS was simulated more accurately by temperature at stem part of 20 cm height or air temperature (T a ) around the part when compared with T A at a weather station (Lu et al 2004, 2007, Zou et al 2005. So far, little is known about how T p is regulated by microclimate or irrigated water (Hu et al 2006).…”