Effects Of Different Rootstocks On Cold Torlerance And Nutritional Quality Of Eggplant

Eggplant (Solanum melongena L.) ,an important greenhouse vegetable in China ,it originated from the south-east Asia and it is sensitive to temperature . It always meets with low temperature stress in winter and spring greenhouse. Having already known now, vegetable grafting could enhance the ability to resist chilling, promote root absorption of nutrient and development and growth which has been a lot of study in the melon. However, it is also a key problemt that the application prospect of grafting cultivation is determined on weather it can keep the original quality of the fruit The Effects of grafing on cold resisrance and nutrition quality of grafted seedlings were studied with Tuolubamu,Maofen 802as stocks, Xi'anluqie as cion, and with own-rooted seedlings luqiewang as control,in order to offer theory for eggplant grafted planting in winter.The main results were as follows:1. Grafting could notably affect the chilling tolerance of eggplant in low temperature stress stage. The results showed that indexes such as chilling injury index, electrolyte leakage rate, MDA content were all increased in grafted seedlings, but the above indexes increased slower in grafted seedlings, especially in grafted Tuolubamu. SOD, POD, CAT activity of grafted eggplant seedling leaves increased in the primary period of treatment and than reduced. After three days recovery in normal temperature, chilling injury index, electrolytel eakage rate and MDA content fell, while SOD,POD, CAT activity increased. Among the treated materials, the recovery capability of T ( with Tuolubamu as rootstock) was relatively better; and the recovery capability of F(with Maofen 802as stocks) and CK were relatively worse, and there was marked difference between them. So we could markedly improve cold tolerance of grafted eggplant seedlings using Tuolubamu.2. The cold tolerance of grafted eggplant seedlings roots is different with different rootstocks. The result showed that test materials are most sensitivity during treatment initial stages under the temperature 10℃/3℃(day/night). MDA content, POD activity fast enhanced ; but SOD activity ,CAT activity rapidly decreased. After 3 days recovery, SOD activity ,POD activity and CAT activity raised. Among the treated materials , the recovery capability of T( with Tuolubamu as rootstock) was relatively better ; and that of F(with Maofen 802as stocks) and CK were relatively worse ,and there was marked difference between them. So we could markedly improve cold tolerance of eggplant seedling roots using Tuolubamu.3.Such indexes as chlorophyll content , stomatal conductance and photosynthetic rate were all decreased in grafted seedlings as well as own-rooted ones under low temperature stress .However ,those indexes of the grafted seedling with a better cold tolerance rootstock had lesser decreases and recovered more rapidly in normal temperature than others. This indicated that we could markedly improve cold tolerance of grafted eggplant seedlings using Tuolubamu. 4. Through planting grafted and own-rooted eggplant comparative experim entation, grafting not only enhanced cold torlerance of seedling, but also built up chilling tolerance of adult stage, promoted eggplant growth.5. Through experimentation of effects of different rootstocks grafting on quality of eggplant fruit,the results showed that the content of protein and VC in the fruits with grafting were significantly higher than that of control .The distribution trends of protein , Vc and dissoluble-sugar in the part of fruit didn't change. So grafting with Tuolubamu and Maofen 802as stocks will improve the quality of eggplant fruit .