Guava seedlings with rootstocks or interstocks and their reaction to salinity

ABSTRACT The introduction of rootstocks for the guava has become necessary due to the advance of guava decline. Among them, Psidium spp. or their hybrids have been evaluated. In addition to disease resistance, tolerance to salinity must be evaluated in the new rootstocks. The aim of this study was to verify the effect of rootstocks and intergrafts on the mineral composition of Psidium spp. submitted to salt stress. The experiment was setup in a randomized block design, with the following treatments (scion/rootstock):P. guineense/P. cattleianum; P. guajava/P. guineense/P. cattleianum; P. guajava‘Paluma’/P. guajava; P. guajava ‘Paluma’/P. guineense; P. guajava ‘Cortibel 1’/P. guajava;P. guajava ‘Cortibel 1’/P. guineense; P. cattleianum (purple) and P. cattleianum (yellow), with three replications and three plants per plot. The plants underwent irrigation with saline solution, and the levels of macronutrients, micronutrients and sodium in the scion leaves were evaluated. As rootstock, P. cattleianum results in greater Na uptake, with higher levels in the leaves of the scions, leading to less tolerance to salt stress.

摘要：鉴于番石榴衰退病的蔓延，选用砧木（rootstock）作为番石榴的嫁接砧木已成为必要举措。其中，番属（Psidium）植物及其杂交品种作为砧木的潜力已得到相关评估。除抗病性外，新型砧木的耐盐性亦需开展评价。本研究旨在探究砧木及中间砧（intergrafts）对盐胁迫（salt stress）下番属植物矿物组成的影响。本试验采用随机区组设计，设置如下接穗（scion）/砧木组合处理：几内亚番石榴（*Psidium guineense*）/智利番石榴（*Psidium cattleianum*）；番石榴（*Psidium guajava*）/几内亚番石榴/智利番石榴；‘Paluma’番石榴（*Psidium guajava* ‘Paluma’）/番石榴；‘Paluma’番石榴/几内亚番石榴；‘Cortibel 1’番石榴（*Psidium guajava* ‘Cortibel 1’）/番石榴；‘Cortibel 1’番石榴/几内亚番石榴；紫果智利番石榴与黄果智利番石榴（纯砧处理）。每组处理设置3次重复，每小区种植3株植株。试验植株采用盐溶液灌溉，随后对接穗叶片中的大量元素（macronutrients）、微量元素（micronutrients）及钠元素含量进行测定。结果显示，以智利番石榴作为砧木时，植株对钠的吸收量更高，接穗叶片中钠含量亦随之升高，最终导致其耐盐性下降。