Respon morfologis dan fisiologis bibit berbagai genotipe jarak pagar ( Jatropha curcas L.) terhadap cekaman kekeringan

Content Provider	Semantic Scholar
Author	Syafi, Sartika
Copyright Year	2008
Abstract	SARTIKA SYAFI. Morphological and Physiological Response of Six Genotypes of Jatropha curcas L. seedling to water stress. Under direction of ENDANG MURNIATI and ENDAH RETNO PALUPI. Development of Jatropha in Indonesia is focused on marginal lands to avoid competition with food crops. Therefore, drought tolerant varieties/clones with high productivity are needed in order to meet the target of 1.5 ha jatropha plantation in 2010. The research was aimed at: 1) studying morphological and physiological response of six genotypes of Jatropha curcas L. seedling to drought stress, 2) determining drought tolerance of the six genotypes. The research was conducted in Seed Science and Technology Laboratory at Leuwikopo. Morphological and physiological response was analyzed at Ecophysiology Laboratory and RGCI Laboratory from July to Oktober 2007. Split plot with three replication was used as experimental designed, with soil moisture content, ie. K1=40%, K2=36%, K3=32% as the main plot and genotype as sub-plot, ie. A1=Karanganyar, A2=Sukabumi, A3=NTB (Dompu), A4=IP-1P, A5=IP-1M dan A6= IP-1A. The data was analysed using SAS and DMRT at α=0.05. The results show that soil moisture content significantly affected leaf area, number of opened stomata, shoot dry weight, root dry weight, shoot/root ratio, root length, leaf water content, net assimilation rate, chlorophyll content and carbon content. Leaf area, shoot dry weight, root length and net assimilation rate were also affected by genotype. The interaction of soil moisture content and genotype only affected plant height, leaf thickness and root volume. The increment of plant height averaged of 14.07, 11.02 and 9.73 cm was obtained 8 week after the seedlings were grown on 40, 36 and 32% soil moisture content respectively, with genotype from Sukabumi had the highest increment. Although soil moisture affected the number of opened stomata in which the lower soil moisture resulted in lower number, however, it was not vary among genotypes. Likewise was the shoot dry weight. The low soil moisture (32%) reduced root length. The lower the soil moisture the lower the root length, so as root volume. The reduction of root volume was lowest in IP-1M. Leaf water content was reduced only on those planted in 32% soil moisture. Soil moisture of 32% was considered as drought stress condition therefore was used to evaluate drought tolerance of the six genotypes. The sensitivity index show that NTB was the most tolerant genotypes, followed by IP-1M, Karanganyar, IP-1P, Sukabumi and IP-1A respectively.
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Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article