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冷地型草坪草——黑麦草(Lolium perenne.L.)的利用受到夏季高温协迫的限制。而耐热品种筛选可能得到几个品种,因此,建立特定温度下筛选耐热品种的技术在确定用于热带地区的潜在品种时有重要意义。该实验旨在于和持定温度下筛选出耐热的黑麦草品种,并且研究一种用于此目的的可将所有品种准确分离的技术。 在培养箱内培养58个多年生黑麦草栽培品种,每天升高1℃以加强热协迫。分别测定其36、38、42、44、46和48℃时的存活率。一些品种在36℃时发生灼伤。大多数品种可忍受38℃的高温而无明显灼伤。大部分品种在42℃时的存活率大于50％,这表明一些品种可以忍受这一高温。然而,44℃时仅有少数几个品种存活率大于50％。因此,44℃可能是多年生黑平草栽培品种的耐热极限。46℃时,仅仅有JPR092,JPR123和JPR010的存活率达50％或更高一些。48℃时,即使最优良的品种受害程度也很高。因此,在此高温地区黑麦草不能生长。耐热力最大和最小的品种分别为JPR005和JPR178。 不同温度下多年生黑平草栽培品种有不同的耐热力,这说明该实验技术可以用来准确地分辨和挑选合适的多年生黑麦草耐热品种。
The use of cold-type turfgrass, Lolium perenne L., is limited by summer heat and co-ordination. While screening for heat-tolerant varieties may yield several varieties, establishing techniques for screening heat-tolerant cultivars at specific temperatures is of great importance in identifying potential varieties for use in the tropics. The aim of this experiment was to screen out heat-tolerant ryegrass varieties at a fixed temperature and to study a technique that can be used to accurately separate all varieties for this purpose. Cultivation of 58 perennial ryegrass cultivars in the incubator, 1 ℃ daily increase in order to enhance heat coercion. The survival rates at 36, 38, 42, 44, 46 and 48 ° C were determined respectively. Some varieties burn at 36 ° C. Most varieties tolerate high temperatures of 38 ° C without significant burns. Most varieties have a survival rate of> 50% at 42 ° C, indicating that some varieties can tolerate this high temperature. However, only a few species at 44 ° C survived more than 50%. Therefore, 44 ℃ may be the heat tolerance of perennial black flat grass cultivars. At 46 ° C, only the survival rates of JPR092, JPR123 and JPR010 were 50% or higher. At 48 ° C, even the best varieties suffer a high degree of damage. Therefore, ryegrass can not grow in this hot area. The largest and smallest heat resistant varieties are JPR005 and JPR178, respectively. Different temperature black perennial cultivars have different heat tolerance, indicating that the experimental techniques can be used to accurately identify and select the appropriate perennial rye heat-tolerant varieties.