| Iris hexagonus greatly enriches the water landscape of the city whose flowers have rich colorsand plants keep green all the year. It is becoming a new favorite in the water's green at the presenttime. In this study, eight cultivars including 'Cherry Cup','Professor Neil','Noble Moment','Colorific','Acadia Miss','Candlelight Supper','Blue Duke' and 'Birthday Suit' were introducted.Overwintering adaptabilities of them were investigated and the effects of low temperature stress onthe leaves were detected. The phenology and their ornamental were observed. Garden applicationswere investigated. The main research conclusions were as follows:1. To determine cold resistance of the eight cultivars, overwintering adaptabilities of them wereinvestigated and the effects of low temperature stress on the leaves relative electric conductivity(REC), semilethal temperature (LT50), malondialdehyde (MDA) content, superoxide dismutase (SOD)activity, soluble protein (WSP) content and peroxidase (POD) activity were studied. Results showedthat LT50of the eight cultivars were-10.58℃of 'Cherry Cup',-2.6℃of 'Professor Neil',-3.48℃of'Noble Moment',-10.20℃of'Colorific',-6.47℃of'Acadia Miss',-9.35of 'Candlelight Supper',-6.33℃of'Blue Duke' and-2.07℃of'Birthday Suit'. As the low temperature stress intensified, theREC increased, the content of MDA decreased first, and then increased, while SOD, POD and WSPactivity increased first, and then decreased. Considering the morphological and physiologicalindicators of the eight cultivars analyzed by subordinate function, the cold resistance order was'Cherry Cup'>'Colorific'>'Candlelight Supper'>'Acadia Miss'>'Blue Duke'>'Noble Moment'>'Professor Neil'>'Birthday Suit'.2. Observation of the scape height, flower diameter, groups of flowering and cold resistanceshowed that the eight Iris hexagonus cultivars could be divided into three categories.'Cherry Cup','Colorific' and 'Professor Neil' were the first category. They had a high ornamental value with bigflowers, or long scape, or long flowering period or strong cold resistance.'Blue Duke','BirthdaySuit' and 'Acadia Miss' which had a good ornamental value were the second category.'NobleMoment' and 'Candlelight Supper' were the third category. They relatively had a poor ornamentalvalue with small flowers or short scape. Landscape application is depended on the ornamental value.'Professor Neil' and 'Acadia Miss' with long leaves and uniform growth status which can be used alone or be used as background to set off the other plants.'Candlelight Supper' can be used asforeground to decorate parterre or flower border for it short leaves. Compared with the other cultivars,'Cherry Cup' and 'Professor Neil' have a higher ornamental value with big flowers and longflowering period which can be used to make bouquet, ikebana and flower basket.3. Iris hexagonus is an exceptional aquatic plant in landscape application which has beautifulflowers in summer and green leaves in winter. It can combine with the arbor, shrub and grass on thecoast and also can extend to the water body forming a hygrophytes-emergent plants-floatingplants-submerged plants phytocoenosis, which enrich the space level and make up the lacking ofgreen in winter. Iris hexagonus cropping forms were concluded through the survey of some varietiesof applications, such as natural-style planting, container planting and bed planting. The applicationforms were ground and flower border, water edge of the green and the special garden. Considered thepresent application forms of Iris hexagonus, several configuration modes highlighting itscharacteristics were recommend for reference. |
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