Effects of rootstock and scion physiological seedling age on the quality of oriental melon root-cut splice grafted seedlings

DING Xiaochen; LI Mengzhu; FENG Chongran; BIE Zhilong; CHENG Jintao

doi:10.3969/j.issn.1673-2871.2023.12.010

Abstract：In order to investigate the effect of the seedling age of the scion and rootstock on the quality of the grafted ori-ental seedlings,the oriental melon Yangjiaosu was used as the scion and the pumpkin variety Mingxiu was used as root-stock.Three different physiological seedling ages of the rootstock(rootstock with a true leaf revealed,true-leaf dollar coin size,one-leaf one-heart)and the scion physiological seedling age(scion with a true leaf revealed,one-leaf one-heart,two-leaf one-heart)were set respectively,and a total of nine grafting combinations were studied.The results showed that the morphological indicators such as stem diameter,SPAD,leaf area,above ground and underground dry weight,root length,root surface area,root volume,and root quantity,photosynthetic rate,transpiration rate,and growth index of the grafted seedlings at seedling age of scion with a true leaf exposed were the best;the photosynthetic rate,transpiration rate,and growth rate of the grafted seedlings of the true leaf exposed age rootstock were the best.Among the nine combinations,the indexes of grafted seedlings produced by the combination of scion with a true leaf revealed and rootstock with a true leaf revealed were better,among which the photosynthetic rate reached 15.42 μmol·m-2·s-1 and the growth rate reached 18.907 mg·d-1,which were 2.30 times and 1.67 times of the worst combinations(the combination of two leaves and one heart on the scion and one leaf and one heart on the rootstock,and the combination of one leaf and one heart on the scion and rootstock true leaf coin size),respectively.Moreover,it is the optimal combination with short nursery time and fast emergence.