Morphological differences among Raphanus raphanistrum populations and their relationship to related crops

Wild radish (Raphanus raphanistrum) has developed introgressed populations after hybridization with its cultivated counterpart (R. sativus) in California. Hybridization with various Brassica and Sinapis species is also possible. To determine if hybridization is responsible of the genetic diversity of European populations, six wild radish populations with distinct morphological traits were sampled from geographically distant regions in Europe. Plants were cultivated in an oilseed rape field and in insect‐proof cages. Silique and flower morphology, growth, and reproductive traits were measured. The wild radish populations could be discriminated by the morphological traits, but not related to geographic regions. In particular, populations of one region showed wide variability in terms of silique shape and growth behaviour, and small‐sized flowers. Although the origin of morphological diversity in wild radish is unclear, i.e. native or due to gene flow from the cultivated radish or other Brassicaceae, significant morphological divergence was found that could have relevant effects on plant ecology and adaptation.     

威宁县白萝卜优质生产技术

从播前准备、品种选择、播种方式和方法、田间管理、病虫害防治、适时收获等方面系统阐述了威宁白萝卜的优质生产技术措施，以期为广大农民朋友提供科学的技术指导和参考。     

青海八里桥绿萝卜品种提纯复壮技术

为解决八里桥绿萝卜由于长期种植导致部分地区品种退化的问题,通过长期的生产实践,采用原种提纯复壮、良种生产、栽培管理等综合技术,实现了品种的提纯复壮,对维持青海八里桥绿萝卜品种的特殊品质具有重要意义。     

热风干燥温度对脱水白萝卜品质的影响

以"长春大根"白萝卜品种为试材,采用50、60、70、80、90、100℃的热风干燥处理1 cm×1 cm×10 cm的白萝卜条,研究热风干燥温度对脱水白萝卜品质的影响。结果表明,干燥温度为70℃时,脱水速率较快,脱水白萝卜色泽较白,感官品质、食用品质和复水性均较好,VC保留率较高。其次,干燥温度60℃时,脱水速率较慢,形态轻微变形、皱缩,食用品质略差。干燥温度低至50℃时,VC的保留率有所提高,但干燥时间延长,感官及食用品质均有所下降。干燥温度超过80℃后,干燥时间未显著缩短,脱水白萝卜褐变加重,感官品质、食用品质和复水性均变差,VC损失增加。     

The use of vegetable phytometers in the evaluation of the potential response of understorey crops to the aerial environment in an interculture system

Carrots, onions, radishes and peas, growing in pots were placed at various locations in a pear orchard and used as phytometers to characterise the aerial environment. The growth of plants growing beneath the orchard canopy was not significantly less than that of phytometers grown in the open. However, the bulb diameter of radish and onion was significantly reduced when growing immediately beneath pear trees. Radish was selected as a suitable phytometer for further research.     

春白萝卜新品种雪单3 号的选育

雪单3 号是利用双单倍体育种技术选育的春白萝卜新品种。母本ED0108A 是以梅花春萝卜× 白玉春萝卜进行花药培
养获得的DH 系为轮回父本，与不育系进行多次回交，转育成的雄性不育系。父本ED3128 是由迟花春萝卜× 天鸿春萝卜进行
花药培养获得的DH 系。该品种生育期60 d（天），植株开展度45 cm，裂叶，小叶11 对，叶片数20，叶簇平展，叶色深绿；
肉质根长圆柱形，白皮白肉，根长36 cm，横径7.1 cm，单根质量1.1 kg，高抗黑腐病、芜菁花叶病毒病、黄瓜花叶病毒病和花
椰菜花叶病毒病，抗霜霉病，群体整齐度高。每667 m² 产量4 000～5 000 kg。适宜在湖北、湖南、河南、山东等地区早春栽培。     

脱乙酰壳聚糖保鲜水萝卜的研究

采用脱乙酰壳聚糖对水萝卜进行涂膜保鲜研究。以水萝卜失水率为指标,考察了稀醋酸浓度、脱乙酰壳聚糖浓度、浸涂时间对保鲜效果的影响,并测定保鲜前后水萝卜的呼吸强度、颜色、硬度及表面褶皱程度的变化。结果表明,最佳保鲜工艺为脱乙酰壳聚糖浓度为1.5%、醋酸浓度为1.0%、浸涂时间为30s。此工艺处理对水萝卜具有可靠的保鲜效果。     

栽培措施对萝卜生长特性及产量的影响

研究不同栽培措施对萝卜生产的影响,结果表明:试验条件下,播种太早或太迟,对萝卜生长都不利,"瑞雪"萝卜最适播种期应为9月25日至11月5日;利用地膜覆盖,萝卜地上部和地下部的生产速度明显提高,生育期提早,产量比露地提高了36.64%;每667m2种植密度以6 500~7 500株为好。