| To study drought resistance of Phormium tenax,with different kinds of tw o years phormium tenax as sundowner,red fingers,tenax and bronze.Adopt the meth od of mulating soil water control in potted drought,set up the normal water a nd drought conditions group,the normal water supply group was recorded as CK,and the drought conditions were divided into mild drought groups,modera te drought groups and severe drought groups,respectively,T1,T2 and T3.Study for 2 months,measure its growth indicators and related physiological indexes,studied the variety of phormium tenax physiological response and drought resi stance in drought environment ability.The main results were as follows:(1)Under different drought conditions inhibit the growth of the phormium tenax,and since the drought degree of inhibition has been deepened.Four kin ds of phormium tenax in the soil under the condition of moderate and severe drought seedling height growth dropped significantly.Sundowner in T1,T2 and T3 height growth of CK espective171.90%,46.82%and 42.50%;Red fingers in T1,T2 and T3 height growth is CK by 68.24%,48.61%and 68.24%respectively;Tenax in T1,T2 and T3 height growth is CK by 70.03%,48.72%and 70.03%respectively;Bronze in T1,T2 and T3 height growth is CK by 70.38%,60.35%and 20.50%,respectively,under the condition of severe drought seedling height growth was only about a quarter of the normal water supply.Different levels of soil drought were inhibited phormium tenax diameter enlargement.Su ndowmer T1,T2 and T3 diameter growth is CK by 75.45%,57.11%and 75.45%respectively;Red fingers in T1,T2 and T3's diameter growth is CK by 81.59%,71.67%and 81.59%respectively;Tenax in T1,T2 and T3 ground diamet er growth is CK by 81.52%,54.74%and 81.52%respectively;Bronze in T1,T2 and T3,ground diameter growth CK respectively 84.30%,53.44%and 35.81%,severe drought is the most serious effects on the growth,growth in diame ter is only about a third of the normal water supply condition.(2)The four varieties of phormium tenax under normal water supply cond itions as time goes on mild drought damage situation,only a small number of leaf occurrence wilting;As the degree of drought,drought damage index is o n the rise,and the longer the drought,drought damage index,the greater the wilting,leaf plants appeared yellow,dry,and even the phenomenon of some p1 ants die,plant damage more serious.(3)Phormium tenax in drought in environmental conditions,its leaf relativ e water content decreased,the size of the decline because of the drought degre e of different length of drought duration and also differences,in the mild and moderate drought conditions,the leaf relative water content,slow down,falling rapidly under severe drought,shows that phormium tenax has been affected b y the severe drought hemp leaf water status,is not conducive to the growth of phormium tenax.From beginning to end,with the leaf relative water content of sunset in T1,T2 and T3's value has fallen by 38.33%,49.11%and 38.33%respectively;The leaf relative water content of red sword in T1,T2 and T3's value has fallen by 41.72%,48.83%and 41.72%respectively;Leaf relative w ater content of flax in T1,T2 and T3's value has fallen by 33.52%,42.54%a nd 33.52%respectively;Leaf relative water content of bronze in the value of t he T1,T2 and T3 fell 43.64,59.81%and 97.31%,respectively.(4)Four varieties of phormium tenax as the drought degree deepens,the s tructure and function of cell membrane is destroyed,the plant situation also de epen,the drought resistance ability is becoming more and more bad,severe dr ought conditions in phormium tenax malonaldehyde content compared with the normal water supply conditions,were more than 26%,that of severe drought s erious adverse influence on the growth of phormium tenax,the cell membrane there is a certain degree of damage.(5)Under the condition of mild and moderate drought phormium tenax bl ade stress reaction,a huge increase in the contents of Chla and Ch1b showed t he phormium tenax to moderate drought conditions has a certain resistance;Ho wever,as the drought degree of further deepening,starts to break down pigme nt,chlorophyll content began to decline,and Chla is lower than the degree of accumulation Ch1b,shows that drought condition to a certain extent,the phorm ium tenax is sensitive to drought degree is reduced,drought resistance has dro pped significantly.(6)Different degrees of drought conditions on the phormium tenax Pro,S S and SP contents in the leaves is larger,the influence of Pro under mild dro ught has no obvious change,under the moderate especially severe drought incr eased rapidly;SS to accumulate and maintain at a high level;SP is under mil d and moderate drought,first under moderate drought has fallen.The above th ree kinds of osmotic regulation substances in phormium tenax drought resistanc e plays an important role in the process of,through the accumulation of their content to reduce the osmotic potential,thus enhance osmotic regulation ability to resist drought conditions;Under moderate drought since phormium tenax su ffer serious,by the inhibition of protein synthesis,thereby weakening the osmo tic regulation function of SP.(7)Phormium tenax under moderate drought conditions,by reducing the a ctivity of SOD to reduce oxygen molecules in plants and the production of H202,more by the rise of POD and CAT activity decomposition of H202 to eli minate the harm,visible in phormium tenax have certain resistance to drought;Under the condition of severe drought,a significant rise in SOD activity,plan ts produce a large number of molecular oxygen and H202,and the activity of POD and CAT were decreased,the decomposition of H202 ability is reduced,cause plant damage.(8)Four varieties of phormium tenax comprehensive ability of fighting dro ught are strongest with mild drought conditions,varieties,we can know that m ountain of flax average high than other three varieties,that mountain flax in d ry conditions than other varieties had higher resistance.Four varieties of compr ehensive drought resistance ability compare to:Tenax>Sundowner>Red Fingers>Bronze. |
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