干旱区生态环境知识资源中心(Arid): Translocation of photoassimilates in melon vines and fruits under salinity using C-13 isotope

Arid

DOI	10.1016/j.scienta.2020.109659
	Translocation of photoassimilates in melon vines and fruits under salinity using C-13 isotope
	Lima, Reivany E. M.; Farias, Luciana F. de L.; Ferreira, Jorge F. S.; Suarez, Donald L.; Bezerra, Marlos A.
通讯作者	Lima, REM
来源期刊	SCIENTIA HORTICULTURAE
ISSN	0304-4238
EISSN	1879-1018
出版年	2020
卷号	274
英文摘要	Both yield and quality of Cantaloupe melon in semi-arid regions are threatened by high levels of salinity in irrigation waters. Our study aimed to characterize the translocation of photoassimilates in melon plants cultivated under salinity condition, using carbon 13 ((CO2)-C-13) isotopic enrichment. Plants of the melon hybrid 'Zielo' were cultivated and drip-irrigated with waters of electrical conductivity (ECw) of 0.5 and 3.5 dS m(-1). Leaves were evaluated for concentrations of Na, Cl, and sucrose and their CO2 assimilation rate. Fruits were evaluated for their weight, yield, sucrose, and soluble solids. Salinity stress affected both assimilation and accumulation of sugars, decreased fruit number and size. The natural (before enrichment) and enriched C-13 in leaves from three stem regions and fruits were evaluated in the two final weeks of the crop cycle. The isotopic enrichment was applied to leaves of the basal and apical regions of the primary stem and apical leaves of the secondary stem. Although Na and Cl accumulated in all leaves, accumulation was the highest in basal leaves, causing a significant reduction of net assimilation of CO2 in these leaves. Although salinity significantly reduced fruit numbers and weight, it did not affect fruit soluble solids. Under saline conditions, leaves had a greater isotopic preference for the fixation of C-13 than C-12. Two weeks before fruit harvest, regardless of salinity, fruits were the preferential sinks for carbon originated from leaves from the basal and apical parts of the stem. During fruit harvest week, basal and apical leaves of plants irrigated with water of ECw =0.5 dS m(-1) had little or no C-13 contribution to the fruit, whereas leaves (mainly basal) of plants irrigated with ECw =3.5 dS m(-1) continued to send photoassimilates to the fruit. Thus, saline stress reduced fruit size and number significantly and delayed carbon translocation to fruits, delaying fruit maturation. Results suggest that under saline stress, eliminating fertigation two weeks before fruit harvest to reduce fertilizer costs may not be beneficial to melon producers. However, fertigation can be stopped in the last week before harvest when using low-salinity water. Further studies are needed to determine if extending the crop cycle under salinity may compensate for delayed fruit maturation and increase fruit sugars.
英文关键词	Carbon-13 Carbon allocation Cucumis melo L. EA-IRMS Salt stress
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000572433900010
WOS关键词	MINERAL-COMPOSITION ; ACID INVERTASE ; CV HUANGHEMI ; TUBER YIELD ; WATER ; DISCRIMINATION ; IRRIGATION ; GROWTH ; SALT ; PLANT
WOS类目	Horticulture
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326485
作者单位	[Lima, Reivany E. M.; Farias, Luciana F. de L.] Univ Fed Ceara, Dept Agr Engn, Pici Campus Block 804,Humberto Monte Ave, BR-60450760 Fortaleza, Ceara, Brazil; [Ferreira, Jorge F. S.; Suarez, Donald L.] USDA ARS, US Salin Lab, 450 W Big Springs Rd, Riverside, CA 92507 USA; [Bezerra, Marlos A.] Embrapa Trop Agroind, 2270 Dra Sara Mesquita St, BR-60020181 Fortaleza, Ceara, Brazil
推荐引用方式 GB/T 7714	Lima, Reivany E. M.,Farias, Luciana F. de L.,Ferreira, Jorge F. S.,et al. Translocation of photoassimilates in melon vines and fruits under salinity using C-13 isotope[J],2020,274.
APA	Lima, Reivany E. M.,Farias, Luciana F. de L.,Ferreira, Jorge F. S.,Suarez, Donald L.,&Bezerra, Marlos A..(2020).Translocation of photoassimilates in melon vines and fruits under salinity using C-13 isotope.SCIENTIA HORTICULTURAE,274.
MLA	Lima, Reivany E. M.,et al."Translocation of photoassimilates in melon vines and fruits under salinity using C-13 isotope".SCIENTIA HORTICULTURAE 274(2020).