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Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (8): 1579-1588.doi: 10.16420/j.issn.0513-353x.2020-0502

• Research Notes • Previous Articles     Next Articles

Leaf Cytological Characteristics and Resistance Comparison of Four Citrus Rootstocks Under Drought Stress

ZHONG Zaofa1, ZHANG Lijuan1, GAO Sisi1, PENG Ting1,2,*()   

  1. 1College of Life Sciences,Gannan Normal University,Ganzhou,Jiangxi 341000,China
    2National Navel Orange Research Center,Ganzhou,Jiangxi 341000,China
  • Received:2021-04-15 Revised:2021-07-15 Online:2021-08-25 Published:2021-09-06
  • Contact: PENG Ting E-mail:pengting@gnnu.edu.cn

Abstract:

Mature leaves from two-year-old Sanhu red tangerine(Citrus reticulata Blanc.),Chongyi wild mandarin(C. reticulata‘Chongyi’),Poncirus trifoliata and Carrizo citrange(C. sisensis × P. trifoliata‘Carrizo’)were detached and dehydrated for 0,3,and 6 h. The results of relative water loss and electrolyte leakage indicated that the leaves of Sanhu red tangerine had the best water retention capacity and suffered the least cell membrane damage under dehydration. Stomatal density of the lower epidermis was counted via blotting,indicating that Sanhu red tangerine had the lowest stomatal density(325 · mm-2),significantly lower than the other three varieties(P < 0.05). Moreover,blotting using the dehydrated leaves showed that the stomatal aperture area of Sanhu red tangerine decreased more promptly in response to dehydration. In addition,leaf anatomical structure was compared via paraffin sectioning. The palisade parenchyma of Sanhu red tangerine was completely differentiated into two layers,but palisade parenchyma of the other three materials were relatively underdevelopped. The ratio of palisade parenchyma thickness and the sponge parenchyma thickness of Sanhu red tangerine was 0.56,which was significantly higher than that of the other three materials. Finally,principal component analysis indicated that the capacity of the four citrus germplasms tolerant to drought was: Sanhu red tangerine > P. trifoliata > Chongyi wild mandarin > Carrizo citrange. In conclusion,Sanhu red tangerine was the most drought-tolerant one among the four tested varieties,which could be used for drought-tolerant citrus breeding in the future.

Key words: citrus, rootstock, drought tolerance, stomata, leaf cross section structure

CLC Number: